docs(str): moving the actual documentation on the header

- The documentation on the header allow u to see on the files where the
header is inclued

str/ft_split.c

@@ -6,7 +6,7 @@
 /*   By: rparodi <marvin@42.fr>                     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/11/09 13:56:02 by rparodi           #+#    #+#             */
-/*   Updated: 2025/09/01 17:49:19 by rparodi          ###   ########.fr       */
+/*   Updated: 2025/09/05 16:17:50 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -74,15 +74,6 @@ static char	**ext_w(char **words_array, const char *str, char sep, int size)
 	return (words_array);
 }
 
-/**
- * @brief Splits a string into an array of substrings based on a delimiter.
- * 
- * @param s The string to split.
- * @param c The delimiter character.
- * 
- * @return A NULL-terminated array of substrings,
- * or NULL if memory allocation fails.
- */
 char	**ft_split(char const *s, char c)
 {
 	int		size;