diff --git a/docs/pc-requirements.md b/docs/pc-requirements.md
new file mode 100644
index 000000000..cd6bc4a14
--- /dev/null
+++ b/docs/pc-requirements.md
@@ -0,0 +1,18 @@
+# PC requirements
+
+**Linux compatible only**
+
+| Component   | Minimum specifications  |
+| ----------- | ----------------------- |
+| Processor   | x86-64 (64 bits)        |
+| Memory      | 8 GB                    |
+| Disk        | 120 GB SSD              |
+| Monitor     | Full HD resolution      |
+| Motherboard | UEFI & PXE boot support |
+
+## Other considerations
+
+-   The monitor must be flicker-free (no PWM) to preserve the student's attention & eye health.
+-   To avoid damaging the PC ports, all cables (USB, Audio) must be connected to cheaper and easier to replace extension cables.
+-   Energy consumption is an important criterion to be taken into account.
+-   It is better to buy the computers without a Windows licence, as it is an unnecessary extra cost.
diff --git a/subjects/atoibase.en.md b/subjects/atoibase.en.md
index 94fa2534c..f770f0aec 100644
--- a/subjects/atoibase.en.md
+++ b/subjects/atoibase.en.md
@@ -41,7 +41,7 @@ func main() {
 	fmt.Println(piscine.AtoiBase("1111101", "01"))
 	fmt.Println(piscine.AtoiBase("7D", "0123456789ABCDEF"))
 	fmt.Println(piscine.AtoiBase("uoi", "choumi"))
-	fmt.Println(piscine.AtoiBase("bbbbbab", "-ab")
+	fmt.Println(piscine.AtoiBase("bbbbbab", "-ab"))
 }
 ```
 
diff --git a/subjects/atoibase.fr.md b/subjects/atoibase.fr.md
index 3d67678ef..57f9b9aa1 100644
--- a/subjects/atoibase.fr.md
+++ b/subjects/atoibase.fr.md
@@ -41,7 +41,7 @@ func main() {
 	fmt.Println(piscine.AtoiBase("1111101", "01"))
 	fmt.Println(piscine.AtoiBase("7D", "0123456789ABCDEF"))
 	fmt.Println(piscine.AtoiBase("uoi", "choumi"))
-	fmt.Println(piscine.AtoiBase("bbbbbab", "-ab")
+	fmt.Println(piscine.AtoiBase("bbbbbab", "-ab"))
 }
 ```
 
diff --git a/subjects/capitalizeprog.en.md b/subjects/capitalizeprog.en.md
new file mode 100644
index 000000000..0151c867d
--- /dev/null
+++ b/subjects/capitalizeprog.en.md
@@ -0,0 +1,24 @@
+## capitalizeprog
+
+### Instructions
+
+Write a program that capitalizes the first letter of each word **and** lowercases the rest of each word of a `string`.
+
+- A word is a sequence of **alphanumerical** characters.
+
+- If there is more than one argument the program should print `Too many arguments`.
+
+- If there is no arguments given the program should print a newline ("`\n`").
+
+### Usage :
+
+```console
+student@ubuntu:~/capitalizeprog$ go build
+student@ubuntu:~/capitalizeprog$ ./capitalizeprog "Hello! How are you? How+are+things+4you?" | cat -e
+Hello! How Are You? How+Are+Things+4you?$
+student@ubuntu:~/capitalizeprog$ ./capitalizeprog Hello! How are you? | cat -e
+Too many arguments$
+student@ubuntu:~/capitalizeprog$ ./capitalizeprog
+
+student@ubuntu:~/capitalizeprog$
+```
diff --git a/subjects/capitalizeprog.fr.md b/subjects/capitalizeprog.fr.md
new file mode 100644
index 000000000..301dc19ba
--- /dev/null
+++ b/subjects/capitalizeprog.fr.md
@@ -0,0 +1,24 @@
+## capitalizeprog
+
+### Instructions
+
+Écrire un programme qui met en majuscule la première lettre de chaque mot et en minuscule les autres lettres du reste du mot d'une `string`.
+
+- Un mot est une suite de caractères **alphanumériques**.
+
+- Si il y a plus d'un argument le programme doit afficher `Too many arguments`.
+
+- Si il n'y a pas d'arguments le programme doit afficher un newline ("`\n`").
+
+### Utilisation :
+
+```console
+student@ubuntu:~/capitalizeprog$ go build
+student@ubuntu:~/capitalizeprog$ ./capitalizeprog "Hello! How are you? How+are+things+4you?" | cat -e
+Hello! How Are You? How+Are+Things+4you?$
+student@ubuntu:~/capitalizeprog$ ./capitalizeprog Hello! How are you? | cat -e
+Too many arguments$
+student@ubuntu:~/capitalizeprog$ ./capitalizeprog
+
+student@ubuntu:~/capitalizeprog$
+```
diff --git a/subjects/collatzcountdown.en.md b/subjects/collatzcountdown.en.md
index 85dbc8df3..fd380d7d3 100644
--- a/subjects/collatzcountdown.en.md
+++ b/subjects/collatzcountdown.en.md
@@ -4,6 +4,8 @@
 
 Write a function, `CollatzCountdown`, that returns the number of steps necessary to reach 1 using the collatz countdown.
 
+- It must return `-1` if `start` is equal to `0` or negative.
+
 ### Expected function
 
 ```go
diff --git a/subjects/collatzcountdown.fr.md b/subjects/collatzcountdown.fr.md
index 9d150d82d..38682cf79 100644
--- a/subjects/collatzcountdown.fr.md
+++ b/subjects/collatzcountdown.fr.md
@@ -4,7 +4,9 @@
 
 Écrire une fonction, `CollatzCountdown`, qui retournes le nombre d'étapes nécéssaires pour atteindre 1 en utilisant le comptage de collatz.
 
-### FOnction attendue
+- Elle doit renvoyer `-1` si `start` est égal à 0 ou négatif.
+
+### Fonction attendue
 
 ```go
 func CollatzCountdown(start int) int {
@@ -33,8 +35,8 @@ func main() {
 Et son résultat :
 
 ```console
-student@ubuntu:~/student/test$ go build
-student@ubuntu:~/student/test$ ./test
+student@ubuntu:~/piscine-go/test$ go build
+student@ubuntu:~/piscine-go/test$ ./test
 10
-student@ubuntu:~/student/test$
+student@ubuntu:~/piscine-go/test$
 ```
diff --git a/subjects/compareprog.en.md b/subjects/compareprog.en.md
new file mode 100644
index 000000000..0d648f309
--- /dev/null
+++ b/subjects/compareprog.en.md
@@ -0,0 +1,24 @@
+## compareprog
+
+### Instructions
+
+Write a program that behaves like the `Compare` function.
+
+This program prints a number after comparing two `strings` lexicographically.
+
+### Usage :
+
+```console
+student@ubuntu:~/compareprog$ go build
+student@ubuntu:~/compareprog$ ./compareprog a b | cat -e
+-1$
+student@ubuntu:~/compareprog$ ./compareprog a a | cat -e
+0$
+student@ubuntu:~/compareprog$ ./compareprog b a | cat -e
+1$
+student@ubuntu:~/compareprog$ ./compareprog b a d | cat -e
+$
+student@ubuntu:~/compareprog$ ./compareprog | cat -e
+$
+student@ubuntu:~/compareprog$
+```
diff --git a/subjects/compareprog.fr.md b/subjects/compareprog.fr.md
new file mode 100644
index 000000000..ebdaf7345
--- /dev/null
+++ b/subjects/compareprog.fr.md
@@ -0,0 +1,24 @@
+## compareprog
+
+### Instructions
+
+Écrire un programme qui se comporte comme la fonction `Compare`.
+
+Ce programme affiche un nombre après avoir comparé deux `strings` lexicalement.
+
+### Utilisation :
+
+```console
+student@ubuntu:~/compareprog$ go build
+student@ubuntu:~/compareprog$ ./compareprog a b | cat -e
+-1$
+student@ubuntu:~/compareprog$ ./compareprog a a | cat -e
+0$
+student@ubuntu:~/compareprog$ ./compareprog b a | cat -e
+1$
+student@ubuntu:~/compareprog$ ./compareprog b a d | cat -e
+$
+student@ubuntu:~/compareprog$ ./compareprog | cat -e
+$
+student@ubuntu:~/compareprog$
+```
diff --git a/subjects/concatparams.en.md b/subjects/concatparams.en.md
index de48463ec..5bdbbb9c3 100644
--- a/subjects/concatparams.en.md
+++ b/subjects/concatparams.en.md
@@ -2,7 +2,7 @@
 
 ### Instructions
 
-Write a function that takes the arguments reveived in parameters and returns them as a `string`.
+Write a function that takes the arguments received in parameters and returns them as a `string`.
 
 The arguments must be **separated** by a `\n`.
 
@@ -10,6 +10,7 @@ The arguments must be **separated** by a `\n`.
 
 ```go
 func ConcatParams(args []string) string {
+	
 }
 ```
 
diff --git a/subjects/displayfile.en.md b/subjects/displayfile.en.md
index 97153fc1f..525b835a9 100644
--- a/subjects/displayfile.en.md
+++ b/subjects/displayfile.en.md
@@ -4,7 +4,7 @@
 
 Write a program that displays, on the standard output, the content of a file given as argument.
 
-- Create a file `quest8.txt` and write nito it the sentence `Almost there!!`
+- Create a file `quest8.txt` and write into it the sentence `Almost there!!`
 
 - The argument of the program in this case should be, `quest8.txt`.
 
@@ -12,7 +12,7 @@ Write a program that displays, on the standard output, the content of a file giv
   - `File name missing`.
   - `Too many arguments`.
 
-### Usage:
+### Usage :
 
 ```console
 student@ubuntu:~/student/displayfile$ go build
diff --git a/subjects/doop.en.md b/subjects/doop.en.md
index 58ac5b07f..1e55cfd8e 100644
--- a/subjects/doop.en.md
+++ b/subjects/doop.en.md
@@ -23,14 +23,12 @@ The program has to handle the modulo and division operations by 0 as shown on th
 ```console
 student@ubuntu:~/piscine-go/test$ go build doop.go
 student@ubuntu:~/piscine-go/test$ ./doop
-student@ubuntu:~/piscine-go/test$ ./doop 1 + 1
-2
+student@ubuntu:~/piscine-go/test$ ./doop 1 + 1 | cat -e
+2$
 student@ubuntu:~/piscine-go/test$ ./doop hello + 1 | cat -e
 0$
-student@ubuntu:~/piscine-go/test$ ./doop 1 p 1
-0
-student@ubuntu:~/piscine-go/test$ ./doop 1 + 1
-2
+student@ubuntu:~/piscine-go/test$ ./doop 1 p 1 | cat -e
+0$
 student@ubuntu:~/piscine-go/test$ ./doop 1 / 0 | cat -e
 No division by 0$
 student@ubuntu:~/piscine-go/test$ ./doop 1 % 0 | cat -e
diff --git a/subjects/doop.fr.md b/subjects/doop.fr.md
index 8f799ea1c..b9201030d 100644
--- a/subjects/doop.fr.md
+++ b/subjects/doop.fr.md
@@ -10,12 +10,11 @@ Le programme doit être utilisé avec trois arguments:
 - Un opérateur
 - Une autre valeur
 
-
 En cas d'opérateur invalide le programme affiche `0`.
 
 En cas de nombre invalide d'arguments le programme affiche rien.
 
-Le programme doit géré les opérations modulo et division par 0 comme dans les examples ci-dessous. 
+Le programme doit géré les opérations modulo et division par 0 comme dans les examples ci-dessous.
 
 `fmt.Print` est autorisé.
 
@@ -24,19 +23,16 @@ Le programme doit géré les opérations modulo et division par 0 comme dans les
 ```console
 student@ubuntu:~/piscine-go/test$ go build doop.go
 student@ubuntu:~/piscine-go/test$ ./doop
-student@ubuntu:~/piscine-go/test$ ./doop 1 + 1
-2
+student@ubuntu:~/piscine-go/test$ ./doop 1 + 1 | cat -e
+2$
 student@ubuntu:~/piscine-go/test$ ./doop hello + 1 | cat -e
 0$
-student@ubuntu:~/piscine-go/test$ ./doop 1 p 1
-0
-student@ubuntu:~/piscine-go/test$ ./doop 1 + 1
-2
-student@ubuntu:~/piscine-go/test$ ./doop 1 / 0
-No division by 0
-student@ubuntu:~/piscine-go/test$ ./doop 1 % 0
-No modulo by 0
-student@ubuntu:~/piscine-go/test$ ./doop 1 * 1
+student@ubuntu:~/piscine-go/test$ ./doop 1 p 1 | cat -e
+0$
+student@ubuntu:~/piscine-go/test$ ./doop 1 / 0 | cat -e
+No division by 0$
+student@ubuntu:~/piscine-go/test$ ./doop 1 % 0 | cat -e
+No modulo by 0$
+student@ubuntu:~/piscine-go/test$ ./doop 1 "*" 1
 1
-
 ```
diff --git a/subjects/firstruneprog.en.md b/subjects/firstruneprog.en.md
new file mode 100644
index 000000000..41005f008
--- /dev/null
+++ b/subjects/firstruneprog.en.md
@@ -0,0 +1,19 @@
+## firstruneprog
+
+### Instructions
+
+Write a program that receives a `string` and returns the first `rune` of that `string`.
+
+### Expected output :
+
+```console
+student@ubuntu:~/piscine-go/firstruneprog$ go build
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "this is not happening"
+t
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "hello" | cat-e
+h$
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "this" "is" "not" "happening"
+student@ubuntu:~/piscine-go/firstruneprog$
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog
+student@ubuntu:~/piscine-go/firstruneprog$
+```
diff --git a/subjects/firstruneprog.fr.md b/subjects/firstruneprog.fr.md
new file mode 100644
index 000000000..771d35e30
--- /dev/null
+++ b/subjects/firstruneprog.fr.md
@@ -0,0 +1,19 @@
+## firstruneprog
+
+### Instructions
+
+Écrire un programme qui reçoit une `string` et qui retourne la première `rune` de cette `string`.
+
+### Utilisation :
+
+```console
+student@ubuntu:~/piscine-go/firstruneprog$ go build
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "this is not happening"
+t
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "hello" | cat-e
+h$
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "this" "is" "not" "happening"
+student@ubuntu:~/piscine-go/firstruneprog$
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog
+student@ubuntu:~/piscine-go/firstruneprog$
+```
diff --git a/subjects/ispowerof2.en.md b/subjects/ispowerof2.en.md
index 62ddde45f..b9d8ead24 100644
--- a/subjects/ispowerof2.en.md
+++ b/subjects/ispowerof2.en.md
@@ -2,14 +2,29 @@
 
 ### Instructions
 
-Write a function that determines if a given number is a power of 2.
+Write a program that determines if a given number is a power of 2.
 
-This function returns `true` if the given number is a power of 2, otherwise it returns `false`.
+This program must print `true` if the given number is a power of 2, otherwise it prints `false`.
 
-### Expected function
+- If there is more than one or no argument the program should print a newline ("`\n`").
 
-```go
-func IsPowerOf2(n uint) bool {
+- Error cases have to be handled.
 
-}
+### Usage :
+
+```console
+student@ubuntu:~/ispowerof2$ go build
+student@ubuntu:~/ispowerof2$ ./ispowerof2 2 | cat -e
+true$
+student@ubuntu:~/ispowerof2$ ./ispowerof2 64 | cat -e
+true$
+student@ubuntu:~/ispowerof2$ ./ispowerof2 513 | cat -e
+false$
+student@ubuntu:~/ispowerof2$ ./ispowerof2
+
+student@ubuntu:~/ispowerof2$ ./ispowerof2 64 1024
+
+student@ubuntu:~/ispowerof2$ ./ispowerof2 notanumber | cat -e
+strconv.Atoi: parsing "a": invalid syntax$
+student@ubuntu:~/ispowerof2$
 ```
diff --git a/subjects/ispowerof2.fr.md b/subjects/ispowerof2.fr.md
index 8147db777..9a266779d 100644
--- a/subjects/ispowerof2.fr.md
+++ b/subjects/ispowerof2.fr.md
@@ -2,14 +2,29 @@
 
 ### Instructions
 
-Écrire une fonction qui détermine si un nombre donné est une puissance de 2.
+Écrire un programme qui détermine si un nombre donné est une puissance de 2.
 
-Cette fonction retourne `true` si le nombre donné est une puissance de 2, autrement elle retourne `false`.
+Ce programme doit afficher `true` si le nombre donné est une puissance de 2, autrement il affiche `false`.
 
-### Fonction attendue
+- Si il y a plus d'un ou aucun argument le programme doit afficher un newline ("`\n`").
 
-```go
-func IsPowerOf2(n uint) bool {
+- Les cas d'erreurs doivent être gérés.
 
-}
+### Utilisation :
+
+```console
+student@ubuntu:~/ispowerof2$ go build
+student@ubuntu:~/ispowerof2$ ./ispowerof2 2 | cat -e
+true$
+student@ubuntu:~/ispowerof2$ ./ispowerof2 64 | cat -e
+true$
+student@ubuntu:~/ispowerof2$ ./ispowerof2 513 | cat -e
+false$
+student@ubuntu:~/ispowerof2$ ./ispowerof2
+
+student@ubuntu:~/ispowerof2$ ./ispowerof2 64 1024
+
+student@ubuntu:~/ispowerof2$ ./ispowerof2 notanumber | cat -e
+strconv.Atoi: parsing "a": invalid syntax$
+student@ubuntu:~/ispowerof2$
 ```
diff --git a/subjects/lastruneprog.en.md b/subjects/lastruneprog.en.md
new file mode 100644
index 000000000..f9d7e2cde
--- /dev/null
+++ b/subjects/lastruneprog.en.md
@@ -0,0 +1,19 @@
+## lastruneprog
+
+### Instructions
+
+Write a program that receives a `string` and returns the last `rune` of a `string`.
+
+### Expected output :
+
+```console
+student@ubuntu:~/piscine-go/firstruneprog$ go build
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "this is not happening"
+g
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "hello" | cat -e
+o$
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "this" "is" "not" "happening"
+student@ubuntu:~/piscine-go/firstruneprog$
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog
+student@ubuntu:~/piscine-go/firstruneprog$
+```
diff --git a/subjects/lastruneprog.fr.md b/subjects/lastruneprog.fr.md
new file mode 100644
index 000000000..e37225270
--- /dev/null
+++ b/subjects/lastruneprog.fr.md
@@ -0,0 +1,19 @@
+## lastruneprog
+
+### Instructions
+
+Écrire un programme qui reçoit une `string` en paramètre et qui retourne la dernière `rune` de la `string`.
+
+### Utilisation :
+
+```console
+student@ubuntu:~/piscine-go/firstruneprog$ go build
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "this is not happening"
+g
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "hello" | cat -e
+o$
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog "this" "is" "not" "happening"
+student@ubuntu:~/piscine-go/firstruneprog$
+student@ubuntu:~/piscine-go/firstruneprog$ ./firstruneprog
+student@ubuntu:~/piscine-go/firstruneprog$
+```
diff --git a/subjects/nruneprog.en.md b/subjects/nruneprog.en.md
new file mode 100644
index 000000000..460537820
--- /dev/null
+++ b/subjects/nruneprog.en.md
@@ -0,0 +1,22 @@
+## nruneprog
+
+### Instructions
+
+Write a function that returns the nth `rune` of a `string`.
+
+### Expected output :
+
+```console
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 2
+e
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 4 | cat -e
+l$
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 5
+o
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello"
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" f | cat -e
+"f" is not an integer value$
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 9
+Invalid position: "9" in "hello"
+student@ubuntu:~/piscine-go/nruneprog$
+```
diff --git a/subjects/nruneprog.fr.md b/subjects/nruneprog.fr.md
new file mode 100644
index 000000000..c664eb704
--- /dev/null
+++ b/subjects/nruneprog.fr.md
@@ -0,0 +1,22 @@
+## nruneprog
+
+### Instructions
+
+Écrire un programme qui reçoit une `string` en paramètre et qui retourne la énième `rune` de la `string`.
+
+### Utilisation :
+
+```console
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 2
+e
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 4 | cat -e
+l$
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 5
+o
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello"
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" f | cat -e
+"f" is not an integer value$
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 9
+Invalid position: "9" in "hello"
+student@ubuntu:~/piscine-go/nruneprog$
+```
diff --git a/subjects/printbits.en.md b/subjects/printbits.en.md
index 65be83a1b..259e21861 100644
--- a/subjects/printbits.en.md
+++ b/subjects/printbits.en.md
@@ -2,18 +2,21 @@
 
 ### Instructions
 
-Write a function that takes a byte, and prints it in binary value **without a newline at the end**.
-
-### Expected function
-
-```go
-func PrintBits(octe byte) {
-
-}
+Write a program that takes a number as argument, and prints it in binary value **without a newline at the end**.
+
+- If the the argument is not a number the program should print `00000000`.
+
+### Expected output :
+
+```console
+student@ubuntu:~/printbits$ go build
+student@ubuntu:~/printbits$ ./printbits 1
+00000001student@ubuntu:~/printbits$
+student@ubuntu:~/printbits$ ./printbits 192
+11000000student@ubuntu:~/printbits$
+student@ubuntu:~/printbits$ ./printbits a
+00000000student@ubuntu:~/printbits$
+student@ubuntu:~/printbits$ ./printbits 1 1
+student@ubuntu:~/printbits$ ./printbits
+student@ubuntu:~/printbits$
 ```
-
-### Usage
-
-Example of output:
-
-If 2 is passed to the function `PrintBits`, it will print "00000010".
diff --git a/subjects/printbits.fr.md b/subjects/printbits.fr.md
index 8e546ddd0..724a1c24f 100644
--- a/subjects/printbits.fr.md
+++ b/subjects/printbits.fr.md
@@ -2,18 +2,21 @@
 
 ### Instructions
 
-Écrire une fonction qui prend un `byte`, et qui l'affiche en valeur binaire **sans newline à la fin**.
-
-### Fonction attendue
-
-```go
-func PrintBits(octe byte) {
-
-}
+Écrire un programme qui prend un nombre en argument, et qui l'affiche en valeur binaire **sans newline à la fin**.
+
+- Si l'argument n'est pas un nombre le programme doit afficher `00000000`.
+
+### Expected output :
+
+```console
+student@ubuntu:~/printbits$ go build
+student@ubuntu:~/printbits$ ./printbits 1
+00000001student@ubuntu:~/printbits$
+student@ubuntu:~/printbits$ ./printbits 192
+11000000student@ubuntu:~/printbits$
+student@ubuntu:~/printbits$ ./printbits a
+00000000student@ubuntu:~/printbits$
+student@ubuntu:~/printbits$ ./printbits 1 1
+student@ubuntu:~/printbits$ ./printbits
+student@ubuntu:~/printbits$
 ```
-
-### Usage
-
-Exemple d'output:
-
-Si 2 est passé à la fonction `PrintBits`, elle affichera "00000010".
diff --git a/subjects/printcombn.fr.md b/subjects/printcombn.fr.md
index 4712d665f..8f0a1c9f3 100644
--- a/subjects/printcombn.fr.md
+++ b/subjects/printcombn.fr.md
@@ -39,10 +39,10 @@ func main() {
 Et son résultat :
 
 ```console
-student@ubuntu:~/piscine/test$ go build
-student@ubuntu:~/piscine/test$ ./test
+student@ubuntu:~/piscine-go/test$ go build
+student@ubuntu:~/piscine-go/test$ ./test
 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
-01, 02, 03, 04, 05, 06, 07, 08, 09, 12, 13, 14, 15, 16, 17, 18, 19, 23, 24, 25, 26, 27, 28, 29, 34, 35, 36, 37, 38, 39, 45, 46, 47, 48, 49, 56, 57, 58, 59, 67, 68, 69, 78, 79, 89
-012, 013, 014, 015, 016, 017, 018, 019, 023, 024, 025, 026, 027, 028, 029, 034, 035, 036, 037, 038, 039, 045, 046, 047, 048, 049, 056, 057, 058, 059, 067, 068, 069, 078, 079, 089, 123, 124, 125, 126, 127, 128, 129, 134, 135, 136, 137, 138, 139, 145, 146, 147, 148, 149, 156, 157, 158, 159, 167, 168, 169, 178, 179, 189, 234, 235, 236, 237, 238, 239, 245, 246, 247, 248, 249, 256, 257, 258, 259, 267, 268, 269, 278, 279, 289, 345, 346, 347, 348, 349, 356, 357, 358, 359, 367, 368, 369, 378, 379, 389, 456, 457, 458, 459, 467, 468, 469, 478, 479, 489, 567, 568, 569, 578, 579, 589, 678, 679, 689, 789
-student@ubuntu:~/piscine/test$
+012, 013, 014, 015, 016, 017, 018, ... 679, 689, 789
+012345678, 012345679, ..., 123456789
+student@ubuntu:~/piscine-go/test$
 ```
diff --git a/subjects/printstr.en.md b/subjects/printstr.en.md
index 2c59d3792..a50a22b6d 100644
--- a/subjects/printstr.en.md
+++ b/subjects/printstr.en.md
@@ -2,7 +2,7 @@
 
 ### Instructions
 
-- Write a function that prints one by one the characters of a string on the screen.
+- Write a function that prints one by one the characters of a `string` on the screen.
 
 ### Expected function
 
@@ -31,7 +31,7 @@ And its output :
 
 ```console
 student@ubuntu:~/piscine-go/test$ go build
-student@ubuntu:~/piscine-go/test$ ./test
+student@ubuntu:~/piscine-go/test$ ./test | cat -e
 Hello World!%
 student@ubuntu:~/piscine-go/test$
 ```
diff --git a/subjects/printstr.fr.md b/subjects/printstr.fr.md
index 29ceb6311..5900ba01e 100644
--- a/subjects/printstr.fr.md
+++ b/subjects/printstr.fr.md
@@ -2,7 +2,7 @@
 
 ### Instructions
 
-- Écrire une fonction qui affiche un à un les caractères d'une chaîne à l'écran.
+- Écrire une fonction qui affiche un à un les caractères d'une `string` à l'écran.
 
 ### Fonction attendue
 
@@ -31,7 +31,7 @@ Et son résultat :
 
 ```console
 student@ubuntu:~/piscine-go/test$ go build
-student@ubuntu:~/piscine-go/test$ ./test
+student@ubuntu:~/piscine-go/test$ ./test | cat -e
 Hello World!%
 student@ubuntu:~/piscine-go/test$
 ```
diff --git a/subjects/printstrprog.en.md b/subjects/printstrprog.en.md
new file mode 100644
index 000000000..8cf79be26
--- /dev/null
+++ b/subjects/printstrprog.en.md
@@ -0,0 +1,17 @@
+## printstrprog
+
+### Instructions
+
+- Write a program that prints one by one the characters of a `string` passed as an argument of the program.
+
+### Expected output :
+
+```console
+student@ubuntu:~/piscine-go/printstrprog$ go build
+student@ubuntu:~/piscine-go/printstrprog$ ./printstrprog "Hello World!" | cat -e
+Hello World!$
+student@ubuntu:~/piscine-go/printstrprog$ ./printstrprog
+student@ubuntu:~/piscine-go/printstrprog$
+student@ubuntu:~/piscine-go/printstrprog$ ./printstrprog "Hello" "World"
+student@ubuntu:~/piscine-go/printstrprog$
+```
diff --git a/subjects/printstrprog.fr.md b/subjects/printstrprog.fr.md
new file mode 100644
index 000000000..bed639582
--- /dev/null
+++ b/subjects/printstrprog.fr.md
@@ -0,0 +1,17 @@
+## printstrprog
+
+### Instructions
+
+- Écrire un programme qui affiche un à un les caractères d'une `string` passée en argument du programme.
+
+### Utilisation :
+
+```console
+student@ubuntu:~/piscine-go/printstrprog$ go build
+student@ubuntu:~/piscine-go/printstrprog$ ./printstrprog "Hello World!" | cat -e
+Hello World!$
+student@ubuntu:~/piscine-go/printstrprog$ ./printstrprog
+student@ubuntu:~/piscine-go/printstrprog$
+student@ubuntu:~/piscine-go/printstrprog$ ./printstrprog "Hello" "World"
+student@ubuntu:~/piscine-go/printstrprog$
+```
diff --git a/subjects/range.en.md b/subjects/range.en.md
index c1daa7493..116525ef5 100644
--- a/subjects/range.en.md
+++ b/subjects/range.en.md
@@ -2,23 +2,29 @@
 
 ### Instructions
 
-Write the function `Range` which must:
+Write a program which must:
 
-- allocate (with make()) an array of integers.
-- fill it with consecutive values that begin at `start` and end at `end` (Including `start` and `end` !)
-- and that returns that array.
+- **Allocate (with make())** an array of integers.
 
-### Expected function
+- Fill it with consecutive values that begins at the first argument and end at the second argument (Including the values of thoses arguments !).
 
-```go
-func Range(start, end int) []int {
+- That prints the array.
 
-}
-```
+Errors should be handled.
+
+If the number of arguments is different from 2 the program prints a newline ("`\n`").
 
-### Usage
+### Expected output :
 
-- With (1, 3) you will return an array containing 1, 2 and 3.
-- With (-1, 2) you will return an array containing -1, 0, 1 and 2.
-- With (0, 0) you will return an array containing 0.
-- With (0, -3) you will return an array containing 0, -1, -2 and -3.
+```console
+student@ubuntu:~/range$ go build
+student@ubuntu:~/range$ ./range 1 3
+[1 2 3]
+student@ubuntu:~/range$ ./range -1 2 | cat -e
+[-1 0 1 2]$
+student@ubuntu:~/range$ ./range 0 0
+[0]
+student@ubuntu:~/reverserange$ ./reverserange 0 nan | cat -e
+strconv.Atoi: parsing "nan": invalid syntax$
+student@ubuntu:~/range$
+```
diff --git a/subjects/range.fr.md b/subjects/range.fr.md
index 3dccdc993..bf219d81c 100644
--- a/subjects/range.fr.md
+++ b/subjects/range.fr.md
@@ -2,23 +2,29 @@
 
 ### Instructions
 
-Écrire la fonction `Range` qui doit:
+Écrire un programme qui doit:
 
-- allouer (avec make()) une slice d'entiers.
-- le remplir avec des valeurs consécutives qui commencent à `start` et qui finissent à `end` (En incluant `start` et `end` !)
-- et qui retourne cette slice.
+- Allouer (avec make()) une slice d'entiers.
 
-### Fonction attendue
+- Le remplir avec des valeurs consécutives qui commencent au premier argument et qui finissent au deuxième (En incluant les valeurs des deux arguments !)
 
-```go
-func Range(start, end int) []int {
+- Et qui affiche cette slice.
 
-}
-```
+Les erreurs doivent être gérées.
+
+Si le nombre d'arguments est différent de 2 le programme affiche un newline ("`\n`").
 
 ### Utilisation
 
-- Avec (1, 3) la fonction devra retourner une slice contenant 1, 2 et 3.
-- Avec (-1, 2) la fonction devra retourner une slice contenant -1, 0, 1 et 2.
-- Avec (0, 0) la fonction devra retourner une slice contenant 0.
-- Avec (0, -3) la fonction devra retourner une slice contenant 0, -1, -2 et -3.
+```console
+student@ubuntu:~/range$ go build
+student@ubuntu:~/range$ ./range 1 3
+[1 2 3]
+student@ubuntu:~/range$ ./range -1 2 | cat -e
+[-1 0 1 2]$
+student@ubuntu:~/range$ ./range 0 0
+[0]
+student@ubuntu:~/reverserange$ ./reverserange 0 nan | cat -e
+strconv.Atoi: parsing "nan": invalid syntax$
+student@ubuntu:~/range$
+```
diff --git a/subjects/rectangle.en.md b/subjects/rectangle.en.md
index 7fb3197cd..bee1bf2ff 100644
--- a/subjects/rectangle.en.md
+++ b/subjects/rectangle.en.md
@@ -11,11 +11,9 @@ is defined by the points of the upper left and lower right corners.
 
 - The struct `rectangle` has to have two variables, `upLeft` and `downRight` type `point`.
 
-- Our main task is to make a program that:
-
-      	- Given a slice of points of size `n` returns the smallest rectangle that contains all the points in the vector of points. The name of that function is `defineRectangle`
-
-      	- And calculates and prints the area of that rectangle you define.
+- The goal is to make a program that:
+  - Given a slice of points of size `n` returns the smallest rectangle that contains all the points in the vector of points. The name of that function is `defineRectangle`.
+  - And which calculates and prints the area of that rectangle you define.
 
 ### Expected main and function for the program
 
diff --git a/subjects/rectangle.fr.md b/subjects/rectangle.fr.md
index 7fb3197cd..33dea8f03 100644
--- a/subjects/rectangle.fr.md
+++ b/subjects/rectangle.fr.md
@@ -2,22 +2,19 @@
 
 ### Instructions
 
-Consider that a point is defined by its coordinates and that a rectangle
-is defined by the points of the upper left and lower right corners.
+Considérer qu'un point est défini par ses coordonnées et qu'un rectangle est défini par les points de son coin du haut à gauche et son coin du bas à droite.
 
-- Define two structures named, `point` and `rectangle`.
+- Définir deux structures nommées, `point` et `rectangle`.
 
-- The struct `point` has to have two variables, `x` and `y`, type `int`.
+- La structure `point` doit avoir deux variables, `x` et `y`, de type `int`.
 
-- The struct `rectangle` has to have two variables, `upLeft` and `downRight` type `point`.
+- La structure `rectangle` doit avoir deux variables, `upLeft` et `downRight` de type `point`.
 
-- Our main task is to make a program that:
+- Le but est de faire un programme qui:
+  - Avec une slice de points donnée de taille `n` retournes le plus petit rectangle qui contient tous les points dans le vecteur de points0. Le nom de cette fonction est `defineRectangle`.
+  - Et qui calcules et affiche l'airethe de ce rectangle défini.
 
-      	- Given a slice of points of size `n` returns the smallest rectangle that contains all the points in the vector of points. The name of that function is `defineRectangle`
-
-      	- And calculates and prints the area of that rectangle you define.
-
-### Expected main and function for the program
+### Main et fonctions attendues pour ce programme
 
 ```go
 func defineRectangle(ptr *point, n int) *rectangle {
diff --git a/subjects/reversebits.en.md b/subjects/reversebits.en.md
index 891812220..433e3258c 100644
--- a/subjects/reversebits.en.md
+++ b/subjects/reversebits.en.md
@@ -2,26 +2,20 @@
 
 ### Instructions
 
-Write a function that takes a `byte`, that reverses it `bit` by `bit` (like the
-example) and that returns the result.
-
-### Expected function
-
-```go
-func ReverseBits(octet byte) byte {
-
-}
-```
-
-Example:
-
-1 byte
-
----
-
-```
-00100110
-   ||
-   \/
-01100100
+Write a program that takes a `byte` in binary format, that reverses it `bit` by `bit` (as shown in the
+example) and that prints the result.
+
+### Expected output
+
+```console
+student@ubuntu:~/piscine-go/reversebits$ go build
+student@ubuntu:~/piscine-go/reversebits$ ./reversebits
+Not enough arguments.
+student@ubuntu:~/piscine-go/reversebits$ ./reversebits 00100110 | cat -e
+01100100$
+student@ubuntu:~/piscine-go/reversebits$ ./reversebits "djs"
+The argument "djs" does not represent a byte
+student@ubuntu:~/piscine-go/reversebits$ ./reversebits "0102039s" | cat -e
+The argument "0102039s" does not represent a byte$
+student@ubuntu:~/piscine-go/reversebits$
 ```
diff --git a/subjects/reversebits.fr.md b/subjects/reversebits.fr.md
index 5277611e7..50126970b 100644
--- a/subjects/reversebits.fr.md
+++ b/subjects/reversebits.fr.md
@@ -2,25 +2,19 @@
 
 ### Instructions
 
-Écrire une fonction qui prend un `byte`, qui l'inverse `bit` par `bit` (comme sur l'exemple) et qui retourne le résultat.
-
-### Fonction attendue
-
-```go
-func ReverseBits(octet byte) byte {
-
-}
-```
-
-Exemple:
-
-1 byte
-
----
-
-```
-00100110
-   ||
-   \/
-01100100
+Écrire un programme qui prend un `byte`, qui l'inverse `bit` par `bit` (comme montré sur l'exemple) et qui affiche le résultat.
+
+### Utilisation
+
+```console
+student@ubuntu:~/piscine-go/reversebits$ go build
+student@ubuntu:~/piscine-go/reversebits$ ./reversebits
+Not enough arguments.
+student@ubuntu:~/piscine-go/reversebits$ ./reversebits 00100110 | cat -e
+01100100$
+student@ubuntu:~/piscine-go/reversebits$ ./reversebits "djs"
+The argument "djs" does not represent a byte
+student@ubuntu:~/piscine-go/reversebits$ ./reversebits "0102039s" | cat -e
+The argument "0102039s" does not represent a byte$
+student@ubuntu:~/piscine-go/reversebits$
 ```
diff --git a/subjects/reverserange.en.md b/subjects/reverserange.en.md
index 489fa9a83..5eb8e79d7 100644
--- a/subjects/reverserange.en.md
+++ b/subjects/reverserange.en.md
@@ -2,23 +2,31 @@
 
 ### Instructions
 
-Write the function `ReverseRange` which must:
+Write a program which must:
 
-- allocate (with make()) an array of integers.
-- fill it with consecutive values that begin at `end` and end at `start` (Including `start` and `end` !)
-- and that returns that array.
+- **Allocate (with make())** an array of integers.
 
-### Expected function
+- Fill it with consecutive values that begins at the second argument and end at the first argument (Including the values of thoses arguments !).
 
-```go
-func ReverseRange(start, end int) []int {
+- That prints the array.
 
-}
-```
+Errors should be handled.
+
+If the number of arguments is different from 2 the program prints a newline ("`\n`").
 
 ### Usage :
 
-- With (1, 3) the function will return an array containing 3, 2 and 1.
-- With (-1, 2) the function will return an array containing 2, 1, 0 and -1.
-- With (0, 0) the function will return an array containing 0.
-- With (0, -3) the function will return an array containing -3, -2, -1 and 0.
+```console
+student@ubuntu:~/reverserange$ go build
+student@ubuntu:~/reverserange$ ./reverserange 1 3
+[3 2 1]
+student@ubuntu:~/reverserange$ ./reverserange -1 2 | cat -e
+[2 1 0 -1]$
+student@ubuntu:~/reverserange$ ./reverserange 0 0
+[0]
+student@ubuntu:~/reverserange$ ./reverserange 0 -3
+[-3 -2 -1 0]
+student@ubuntu:~/reverserange$ ./reverserange 0 nan | cat -e
+strconv.Atoi: parsing "nan": invalid syntax$
+student@ubuntu:~/reverserange$
+```
diff --git a/subjects/reverserange.fr.md b/subjects/reverserange.fr.md
index bb65691d1..2acf2f6f4 100644
--- a/subjects/reverserange.fr.md
+++ b/subjects/reverserange.fr.md
@@ -2,23 +2,31 @@
 
 ### Instructions
 
-Écrire la fonction `ReverseRange` qui doit:
+Écrire un programme qui doit:
 
-- allouer (avec make()) une slice d'entiers.
-- le remplir avec des valeurs consécutives qui commencent à `end` et qui finissent à `start` (En incluant `start` et `end` !)
-- et qui retourne cette slice.
+- Allouer (avec make()) une slice d'entiers.
 
-### Fonction attendue
+- Le remplir avec des valeurs consécutives qui commencent au deuxième argument et qui finissent au premier (En incluant les valeurs des deux arguments !)
 
-```go
-func ReverseRange(start, end int) []int {
+- Et qui affiche cette slice.
 
-}
-```
+Les erreurs doivent être gérées.
+
+Si le nombre d'arguments est différent de 2 le programme affiche un newline ("`\n`").
 
 ### Utilisation :
 
-- Avec (1, 3) la fonction devra retourner une slice contenant 3, 2 et 1.
-- Avec (-1, 2) la fonction devra retourner une slice contenant 2, 1, 0 et -1.
-- Avec (0, 0) la fonction devra retourner une slice contenant 0.
-- Avec (0, -3) la fonction devra retourner une slice contenant -3, -2, -1 et 0.
+```console
+student@ubuntu:~/reverserange$ go build
+student@ubuntu:~/reverserange$ ./reverserange 1 3
+[3 2 1]
+student@ubuntu:~/reverserange$ ./reverserange -1 2 | cat -e
+[2 1 0 -1]$
+student@ubuntu:~/reverserange$ ./reverserange 0 0
+[0]
+student@ubuntu:~/reverserange$ ./reverserange 0 -3
+[-3 -2 -1 0]
+student@ubuntu:~/reverserange$ ./reverserange 0 nan | cat -e
+strconv.Atoi: parsing "nan": invalid syntax$
+student@ubuntu:~/reverserange$
+```
diff --git a/subjects/rot14prog.en.md b/subjects/rot14prog.en.md
new file mode 100644
index 000000000..c421a1f71
--- /dev/null
+++ b/subjects/rot14prog.en.md
@@ -0,0 +1,18 @@
+## rot14
+
+### Instructions
+
+Write a program that prints the `string` passed as argument, transformed into a `rot14 string`.
+
+### Usage
+
+```console
+student@ubuntu:~/rot14prog$ go build
+student@ubuntu:~/rot14prog$ ./rot14prog "Hello How are You" | cat -e
+Vszzc Vck ofs Mci$
+student@ubuntu:~/rot14prog$ ./rot14prog Hello How are You
+
+student@ubuntu:~/rot14prog$ ./rot14prog
+
+student@ubuntu:~/rot14prog$
+```
diff --git a/subjects/rot14prog.fr.md b/subjects/rot14prog.fr.md
new file mode 100644
index 000000000..5d3b27365
--- /dev/null
+++ b/subjects/rot14prog.fr.md
@@ -0,0 +1,18 @@
+## rot14
+
+### Instructions
+
+Écrire un programme qui retourne la `string` en paramètre transformée en `string rot14`..
+
+### Utilisation
+
+```console
+student@ubuntu:~/rot14prog$ go build
+student@ubuntu:~/rot14prog$ ./rot14prog "Hello How are You" | cat -e
+Vszzc Vck ofs Mci$
+student@ubuntu:~/rot14prog$ ./rot14prog Hello How are You
+
+student@ubuntu:~/rot14prog$ ./rot14prog
+
+student@ubuntu:~/rot14prog$
+```
diff --git a/subjects/split.en.md b/subjects/split.en.md
index 3ef02c340..b5b8941fd 100644
--- a/subjects/split.en.md
+++ b/subjects/split.en.md
@@ -10,6 +10,7 @@ The separators are the characters of the `charset string` given in parameter.
 
 ```go
 func Split(str, charset string) []string {
+
 }
 ```
 
@@ -27,7 +28,8 @@ import (
 
 func main() {
 	str := "HelloHAhowHAareHAyou?"
-	fmt.Println(piscine.Split(str, charset, "HA")}
+	fmt.Println(piscine.Split(str, "HA"))
+}
 ```
 
 And its output :
diff --git a/subjects/split.fr.md b/subjects/split.fr.md
index 32ea7586f..1d1544181 100644
--- a/subjects/split.fr.md
+++ b/subjects/split.fr.md
@@ -4,12 +4,13 @@
 
 Écrire une fonction qui sépare les mots d'une `string` et les met dans un tableau de `string`.
 
-Les séparateurs sont les caractères de la `string charset` donnée en paramétre.
+Les séparateurs sont les caractères de la `string charset` donnée en paramètre.
 
 ### Fonction attendue
 
 ```go
 func Split(str, charset string) []string {
+
 }
 ```
 
@@ -27,7 +28,8 @@ import (
 
 func main() {
 	str := "HelloHAhowHAareHAyou?"
-	fmt.Println(piscine.Split(str, "HA")}
+	fmt.Println(piscine.Split(str, "HA"))
+}
 ```
 
 Et son résultat :
diff --git a/subjects/splitprog.en.md b/subjects/splitprog.en.md
new file mode 100644
index 000000000..ef563b644
--- /dev/null
+++ b/subjects/splitprog.en.md
@@ -0,0 +1,24 @@
+## splitprog
+
+### Instructions
+
+Write a program which separates the words of a `string`, which puts them in a `string` array and which then prints it to standard output.
+
+The program receives two parameters:
+
+- The first is the `string`
+- The second is the separator
+
+### Usage :
+
+```console
+student@ubuntu:~/piscine-go/splitprog$ go build
+student@ubuntu:~/piscine-go/splitprog$ ./splitprog "HelloHAhowHAareHAyou?" HA | cat -e
+[Hello how are you?]$
+student@ubuntu:~/piscine-go/splitprog$ ./splitprog "Hello,how,are,you?" ","
+[Hello how are you?]
+student@ubuntu:~/piscine-go/splitprog$ ./splitprog "HelloHAhowHAareHAyou?"
+student@ubuntu:~/piscine-go/splitprog$
+student@ubuntu:~/piscine-go/splitprog$ ./splitprog
+student@ubuntu:~/piscine-go/splitprog$
+```
diff --git a/subjects/splitprog.fr.md b/subjects/splitprog.fr.md
new file mode 100644
index 000000000..3ac1d5628
--- /dev/null
+++ b/subjects/splitprog.fr.md
@@ -0,0 +1,24 @@
+## splitprog
+
+### Instructions
+
+Écrire une fonction qui sépare les mots d'une `string`, qui les met dans un tableau de `string` et qui les affichent sur la sortie standard.
+
+Le programme reçoit deux paramètres:
+
+- Le premier est la `string`
+- Le deuxième est le séparateur
+
+### Utilisation :
+
+```console
+student@ubuntu:~/piscine-go/splitprog$ go build
+student@ubuntu:~/piscine-go/splitprog$ ./splitprog "HelloHAhowHAareHAyou?" HA | cat -e
+[Hello how are you?]$
+student@ubuntu:~/piscine-go/splitprog$ ./splitprog "Hello,how,are,you?" ","
+[Hello how are you?]
+student@ubuntu:~/piscine-go/splitprog$ ./splitprog "HelloHAhowHAareHAyou?"
+student@ubuntu:~/piscine-go/splitprog$
+student@ubuntu:~/piscine-go/splitprog$ ./splitprog
+student@ubuntu:~/piscine-go/splitprog$
+```
diff --git a/subjects/splitwhitespaces.en.md b/subjects/splitwhitespaces.en.md
index 02253732c..9e7f4f163 100644
--- a/subjects/splitwhitespaces.en.md
+++ b/subjects/splitwhitespaces.en.md
@@ -10,6 +10,7 @@ The separators are spaces, tabs and newlines.
 
 ```go
 func SplitWhiteSpaces(str string) []string {
+
 }
 ```
 
@@ -27,7 +28,8 @@ import (
 
 func main() {
 	str := "Hello how are you?"
-	fmt.Println(piscine.SplitWhiteSpaces(str)}
+	fmt.Println(piscine.SplitWhiteSpaces(str))
+}
 ```
 
 And its output :
diff --git a/subjects/splitwhitespaces.fr.md b/subjects/splitwhitespaces.fr.md
index 527b709a4..6364066be 100644
--- a/subjects/splitwhitespaces.fr.md
+++ b/subjects/splitwhitespaces.fr.md
@@ -10,6 +10,7 @@ Les séparateurs sont les espaces, les tabulations et les retours à la ligne.
 
 ```go
 func SplitWhiteSpaces(str string) []string {
+
 }
 ```
 
@@ -27,7 +28,8 @@ import (
 
 func main() {
 	str := "Hello how are you?"
-	fmt.Println(piscine.SplitWhiteSpaces(str)}
+	fmt.Println(piscine.SplitWhiteSpaces(str))
+}
 ```
 
 Et son résultat :
diff --git a/subjects/strlen.en.md b/subjects/strlen.en.md
index 68618fc9f..7f9e2b2c0 100644
--- a/subjects/strlen.en.md
+++ b/subjects/strlen.en.md
@@ -2,7 +2,7 @@
 
 ### Instructions
 
-- Write a function that counts the characters of a string and that returns that count.
+- Write a function that counts the characters of a `string` and that returns that count.
 
 ### Expected function
 
diff --git a/subjects/strlen.fr.md b/subjects/strlen.fr.md
index de4de21f4..183355ce9 100644
--- a/subjects/strlen.fr.md
+++ b/subjects/strlen.fr.md
@@ -2,7 +2,7 @@
 
 ### Instructions
 
-- Écrire une fonction qui compte le nombre de caractères d'une chaîne et qui retourne le nombre trouvé.
+- Écrire une fonction qui compte le nombre de caractères d'une `string` et qui retourne le nombre trouvé.
 
 ### Fonction attendue
 
diff --git a/subjects/strlenprog.en.md b/subjects/strlenprog.en.md
new file mode 100644
index 000000000..9899252cd
--- /dev/null
+++ b/subjects/strlenprog.en.md
@@ -0,0 +1,19 @@
+## strlenprog
+
+### Instructions
+
+- Write a program that counts the characters of a `string` and that returns that value.
+
+- If the program receives more than one or no arguments it must not print anything.
+
+### Expected output :
+
+```console
+student@ubuntu:~/piscine-go/strlenprog$ go build
+student@ubuntu:~/piscine-go/strlenprog$ ./strlenprog "hello" | cat -e
+5$
+student@ubuntu:~/piscine-go/strlenprog$ ./strlenprog
+student@ubuntu:~/piscine-go/strlenprog$
+student@ubuntu:~/piscine-go/strlenprog$ ./strlenprog "hello" "how are you"
+student@ubuntu:~/piscine-go/strlenprog$
+```
diff --git a/subjects/strlenprog.fr.md b/subjects/strlenprog.fr.md
new file mode 100644
index 000000000..38e44e776
--- /dev/null
+++ b/subjects/strlenprog.fr.md
@@ -0,0 +1,19 @@
+## strlenprog
+
+### Instructions
+
+- Écrire un programme qui compte le nombre de caractères d'une `string` et qui retourne le nombre trouvé.
+
+- Si le programme reçoit plusieurs ou aucun arguments il ne doit rien afficher.
+
+### Utilisation :
+
+```console
+student@ubuntu:~/piscine-go/strlenprog$ go build
+student@ubuntu:~/piscine-go/strlenprog$ ./strlenprog "hello" | cat -e
+5$
+student@ubuntu:~/piscine-go/strlenprog$ ./strlenprog
+student@ubuntu:~/piscine-go/strlenprog$
+student@ubuntu:~/piscine-go/strlenprog$ ./strlenprog "hello" "how are you"
+student@ubuntu:~/piscine-go/strlenprog$
+```
diff --git a/subjects/strrevprog.en.md b/subjects/strrevprog.en.md
new file mode 100644
index 000000000..ebda9a442
--- /dev/null
+++ b/subjects/strrevprog.en.md
@@ -0,0 +1,15 @@
+## strrevprog
+
+### Instructions
+
+- Write a program that reverses a `string` and prints it in the standard output.
+
+### Expected output :
+
+```console
+student@ubuntu:~/piscine-go/strrevprog$ go build
+student@ubuntu:~/piscine-go/strrevprog$ ./strrevprog "Hello World!" | cat -e
+!dlroW olleH$
+student@ubuntu:~/piscine-go/strrevprog$ ./strrevprog
+student@ubuntu:~/piscine-go/strrevprog$
+```
diff --git a/subjects/strrevprog.fr.md b/subjects/strrevprog.fr.md
new file mode 100644
index 000000000..4a1f62411
--- /dev/null
+++ b/subjects/strrevprog.fr.md
@@ -0,0 +1,15 @@
+## strrevprog
+
+### Instructions
+
+- Écrire un programme qui inverse une `string` et qui l'affiche dans la sortie standard.
+
+### Utilisation :
+
+```console
+student@ubuntu:~/piscine-go/strrevprog$ go build
+student@ubuntu:~/piscine-go/strrevprog$ ./strrevprog "Hello World!" | cat -e
+!dlroW olleH$
+student@ubuntu:~/piscine-go/strrevprog$ ./strrevprog
+student@ubuntu:~/piscine-go/strrevprog$
+```
diff --git a/subjects/to-git-or-not-to-git.en.md b/subjects/to-git-or-not-to-git.en.md
index c312c4109..6970632c7 100644
--- a/subjects/to-git-or-not-to-git.en.md
+++ b/subjects/to-git-or-not-to-git.en.md
@@ -3,7 +3,7 @@
 ### Instructions
 
 Write in a file `to-git-or-not-to-git.sh` the command that isolates your `gitHub id`.
-Only the numbers will appears.
+Only the numbers will appear.
 
 ### Usage