diff --git a/subjects/arrange_it/README.md b/subjects/arrange_it/README.md
index 50a2544c..6d962c25 100644
--- a/subjects/arrange_it/README.md
+++ b/subjects/arrange_it/README.md
@@ -2,8 +2,8 @@
 
 ### Instructions
 
-Create a function called `arrange_phrase` that takes a string literal as a phrase and returns it organized
-Each word will have a number that indicates the position of that word
+Create a **function** called `arrange_phrase` that takes a string literal as a phrase and returns it organized
+Each word will have a number that indicates the position of that word.
 
 > This exercise will test the **heap allocation** of your function!
 > So try your best to allocate the minimum data on the heap!
@@ -11,22 +11,26 @@ Each word will have a number that indicates the position of that word
 ### Expected Function
 
 ```rust
-fn arrange_phrase(phrase: &str) -> String {
+pub fn arrange_phrase(phrase: &str) -> String {
 }
 ```
 
 ### Notions
 
-- https://doc.rust-lang.org/1.22.0/book/first-edition/the-stack-and-the-heap.html
-- https://doc.rust-lang.org/std/primitive.str.html#method.split
+- [stack and heap](https://doc.rust-lang.org/1.22.0/book/first-edition/the-stack-and-the-heap.html)
+- [str.split](https://doc.rust-lang.org/std/primitive.str.html#method.split)
+- [str.matches](https://doc.rust-lang.org/std/primitive.str.html#method.matches)
+- [str.replace](https://doc.rust-lang.org/std/primitive.str.html#method.replace)
 
 ### Usage
 
 Here is a program to test your function
 
 ```rust
+use arrange_it::*;
+
 fn main() {
-    println!("{:?}", initials("is2 Thi1s T4est 3a"));
+    println!("{:?}", arrange_phrase("is2 Thi1s T4est 3a"));
 }
 ```
 
diff --git a/subjects/string_literal/README.md b/subjects/string_literal/README.md
index ddbf41f7..9c0bac96 100644
--- a/subjects/string_literal/README.md
+++ b/subjects/string_literal/README.md
@@ -2,13 +2,13 @@
 
 ### Instructions
 
-Create the following functions:
+Create the following **functions**:
 
-- `is_empty`, that returns true if a string is empty
-- `is_ascii`, that returns true if all characters of a given string is in ASCII range
-- `contains`, that returns true if the string contains a pattern given
-- `split_at`, that divides a string in two returning a tuple
-- `find', that returns the index if the first character of a given string that matches the pattern
+- `is_empty`, which returns `true` if a string is empty
+- `is_ascii`, which returns `true` if all characters of a given string is in ASCII range
+- `contains`, which returns `true` if the string contains a given pattern
+- `split_at`, which divides a string in two returning a tuple
+- `find`, which returns the index if the first character of a given string which matches the pattern
 
 > This exercise will test the **heap allocation** of your function!
 > So try your best to allocate the minimum data on the heap! (hit: &str)
diff --git a/subjects/string_literals/README.md b/subjects/string_literals/README.md
new file mode 100644
index 00000000..ddbf41f7
--- /dev/null
+++ b/subjects/string_literals/README.md
@@ -0,0 +1,53 @@
+## string literal
+
+### Instructions
+
+Create the following functions:
+
+- `is_empty`, that returns true if a string is empty
+- `is_ascii`, that returns true if all characters of a given string is in ASCII range
+- `contains`, that returns true if the string contains a pattern given
+- `split_at`, that divides a string in two returning a tuple
+- `find', that returns the index if the first character of a given string that matches the pattern
+
+> This exercise will test the **heap allocation** of your function!
+> So try your best to allocate the minimum data on the heap! (hit: &str)
+
+### Notions
+
+- https://doc.rust-lang.org/1.22.0/book/first-edition/the-stack-and-the-heap.html
+- https://doc.rust-lang.org/rust-by-example/primitives/literals.html
+
+### Expected Functions
+
+```rust
+fn is_empty(v: &str) -> bool {
+}
+
+fn is_ascii(v: &str) -> bool {
+}
+
+fn contains(v: &str, pat: &str) -> bool {
+}
+
+fn split_at(v: &str, index: usize) -> (&str, &str) {
+}
+
+fn find(v: &str, pat: char) -> usize {
+}
+```
+
+### Usage
+
+Here is a program to test your function
+
+```rust
+
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+student@ubuntu:~/[[ROOT]]/test$
+```
diff --git a/subjects/tic_tac_toe/README.md b/subjects/tic_tac_toe/README.md
index 5086b6f9..97d5728c 100644
--- a/subjects/tic_tac_toe/README.md
+++ b/subjects/tic_tac_toe/README.md
@@ -2,32 +2,40 @@
 
 ### Instructions
 
-You must create a tic tac toe checker.
+You must create a `tic tac toe` checker.
 
 Create the following functions:
 
-- `tic_tac_toe` that receives a table of vectors (Vec<Vec<&str>>) and returns a string : `player O won` or `player X won` or `Tie`
-- `diagonals` that will receive a player and a table. It should return a boolean, this must return true if all the diagonals are completed by the player
-- `horizontal` that will receive a player and a table. It should return a boolean, this must return true if one of the horizontal lines are completed by the player
-- `vertical` that will receive a player and a table. It should return a boolean, this must return true if one of the vertical lines are completed by the player
+- `tic_tac_toe` which receives:
+    - a table of vectors (Vec<Vec<&str>>).
+    - It should return a String `player O won` or `player X won` or `Tie`.
+- `diagonals` which will receive:
+    - a player and a table. 
+    - It should return a boolean, this must return `true` if all the diagonals are completed by the player.
+- `horizontal` which will receive:
+    - a player and a table. 
+    - It should return a boolean, this must return `true` if one of the horizontal lines are completed by the player.
+- `vertical` which will receive: 
+    - a player and a table. 
+    - It should return a boolean, this must return `true` if one of the vertical lines are completed by the player.
 
 ### Notions
 
-- https://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html
+- [references and borrowing](https://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html)
 
 ### Expected Functions
 
 ```rust
-fn tic_tac_toe(table: Vec<Vec<&str>>) -> String {
+pub fn tic_tac_toe(table: Vec<Vec<&str>>) -> String {
 }
 
-fn diagonals(player: &str, table: &Vec<Vec<&str>>) -> bool {
+pub fn diagonals(player: &str, table: &Vec<Vec<&str>>) -> bool {
 }
 
-fn horizontal(player: &str, table: &Vec<Vec<&str>>) -> bool {
+pub fn horizontal(player: &str, table: &Vec<Vec<&str>>) -> bool {
 }
 
-fn vertical(player: &str, table: &Vec<Vec<&str>>) -> bool {
+pub fn vertical(player: &str, table: &Vec<Vec<&str>>) -> bool {
 }
 ```
 
@@ -36,6 +44,8 @@ fn vertical(player: &str, table: &Vec<Vec<&str>>) -> bool {
 Here is a program to test your function
 
 ```rust
+use tic_tac_toe::*;
+
 fn main() {
     println!(
         "{:?}",