removing "-"

subjects/atoibase.en.md

@@ -6,11 +6,11 @@ Write a function that takes a `string` number and its `string` base in parameter
 
 If the base is not valid it returns `0`.
 
-- Validity rules for a base :
+Validity rules for a base :
 
-  - A base must contain at least 2 characters.
-  - Each character of a base must be unique.
-  - A base should not contain `+` or `-` characters.
+- A base must contain at least 2 characters.
+- Each character of a base must be unique.
+- A base should not contain `+` or `-` characters.
 
 String number must contain only elements that are in base.