docs(cameltosnakecase): fix subject

- fix indentation and grammar
- fix markdown

subjects/cameltosnakecase/README.md

@@ -1,32 +1,29 @@
-## Camel-to-snake-case 
+## cameltosnakecase 
 
 ### Instructions
 
-Write a function that converts a string from `camelCase` to `snake_case`.
+Write a function that converts a `string` from `camelCase` to `snake_case`.
 
-For this exercise you need to know that camelCase has two different writing alternatives that will be accepted:
+- If the `string` is empty, return an empty `string`.
+- If the `string` is not `camelCase`, return the `string` unchanged.
+- If the `string` is `camelCase`, return the `snake_case` version of the `string`.
+
+For this exercise you need to know that `camelCase` has two different writing alternatives that will be accepted:
 
 - lowerCamelCase
 - UpperCamelCase
 
-Some rules for writing in camelCase:
+Rules for writing in `camelCase`:
 
 - The word does not end on a capitalized letter (CamelCasE).
 - No two capitalized letters shall follow directly each other (CamelCAse).
 - Numbers or punctuation are not allowed in the word anywhere (camelCase1).
 
-Here are some rules for you to follow:
-
-- If the string is empty, return an empty string.
-- If the string is not `camelCase`, return the string unchanged.
-- If the string is `camelCase`, return the `snake_case` version of the string.
-
-
 ### Expected function 
 
 ```go
 func CamelToSnakeCase(s string) string{
-    //Your code here
+
 }
 ```
 
@@ -37,19 +34,23 @@ Here is a possible program to test your function:
 ```go
 package main
 
-import "fmt"
+import (
+	"fmt"
+
+	"piscine"
+)
 
 func main() {
-    fmt.Println(CamelToSnakeCase("HelloWorld")) 
-    fmt.Println(CamelToSnakeCase("helloWorld"))
-    fmt.Println(CamelToSnakeCase("camelCase"))
-    fmt.Println(CamelToSnakeCase("CAMELtoSnackCASE"))
-    fmt.Println(CamelToSnakeCase("camelToSnakeCase"))
-    fmt.Println(CamelToSnakeCase("132322"))
+	fmt.Println(piscine.CamelToSnakeCase("HelloWorld"))
+	fmt.Println(piscine.CamelToSnakeCase("helloWorld"))
+	fmt.Println(piscine.CamelToSnakeCase("camelCase"))
+	fmt.Println(piscine.CamelToSnakeCase("CAMELtoSnackCASE"))
+	fmt.Println(piscine.CamelToSnakeCase("camelToSnakeCase"))
+	fmt.Println(piscine.CamelToSnakeCase("132322"))
 }
 ```
 
-and the output should be:
+And its output:
 
 ```console
 $ go run .