diff --git a/subjects/atoibase.en.md b/subjects/atoibase.en.md
index f582db42..3d1dde2b 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 165115ad..2993c7fb 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/collatzcountdown.en.md b/subjects/collatzcountdown.en.md
index 02607c56..9c34bf72 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 0 or negative.
+
 ### Expected function
 
 ```go
diff --git a/subjects/collatzcountdown.fr.md b/subjects/collatzcountdown.fr.md
index 9d150d82..49ba0eb6 100644
--- a/subjects/collatzcountdown.fr.md
+++ b/subjects/collatzcountdown.fr.md
@@ -4,6 +4,8 @@
 
 Écrire une fonction, `CollatzCountdown`, qui retournes le nombre d'étapes nécéssaires pour atteindre 1 en utilisant le comptage de collatz.
 
+- Il doit renvoyer `-1` si `start` est égal à 0 ou négatif.
+
 ### FOnction attendue
 
 ```go
diff --git a/subjects/concatparams.en.md b/subjects/concatparams.en.md
index b9425ecd..2aa469d9 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 97153fc1..525b835a 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 d0c5a914..6ac73b67 100644
--- a/subjects/doop.en.md
+++ b/subjects/doop.en.md
@@ -23,18 +23,14 @@ The program has to handle the modulo and division operations by 0 as shown on th
 ```console
 student@ubuntu:~/piscine/test$ go build doop.go
 student@ubuntu:~/piscine/test$ ./doop
-student@ubuntu:~/piscine/test$ ./doop 1 + 1
-2
+student@ubuntu:~/piscine/test$ ./doop 1 + 1 | cat -e
+2$
 student@ubuntu:~/piscine/test$ ./doop hello + 1 | cat -e
 0$
-student@ubuntu:~/piscine/test$ ./doop 1 p 1
-0
-student@ubuntu:~/piscine/test$ ./doop 1 + 1
-2
+student@ubuntu:~/piscine/test$ ./doop 1 p 1 | cat -e
+0$
 student@ubuntu:~/piscine/test$ ./doop 1 / 0 | cat -e
 No division by 0$
 student@ubuntu:~/piscine/test$ ./doop 1 % 0 | cat -e
 No modulo by 0$
-student@ubuntu:~/piscine/test$ ./doop 1 "*" 1
-1
 ```
diff --git a/subjects/split.en.md b/subjects/split.en.md
index cc5f31ba..91f1aa5c 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 641ca5fb..4dabfc6f 100644
--- a/subjects/split.fr.md
+++ b/subjects/split.fr.md
@@ -10,6 +10,7 @@ Les séparateurs sont les caractères de la `string charset` donnée en paramét
 
 ```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/splitwhitespaces.en.md b/subjects/splitwhitespaces.en.md
index e358921e..10cf1f9c 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 0f9776e1..da235c0a 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 :