diff --git a/srcd/part2/ft_substr.c b/srcd/part2/ft_substr.c
index 3ea3480..54e1685 100644
--- a/srcd/part2/ft_substr.c
+++ b/srcd/part2/ft_substr.c
@@ -1,15 +1,3 @@
-/* ************************************************************************** */
-/*                                                                            */
-/*                                                        :::      ::::::::   */
-/*   ft_substr.c                                        :+:      :+:    :+:   */
-/*                                                    +:+ +:+         +:+     */
-/*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
-/*                                                +#+#+#+#+#+   +#+           */
-/*   Created: 2019/11/25 14:01:58 by hulamy            #+#    #+#             */
-/*   Updated: 2019/11/27 19:54:09 by hulamy           ###   ########.fr       */
-/*                                                                            */
-/* ************************************************************************** */
-
 /*
 ** create a copy of a portion of s, begining at start and of length len
 */
@@ -19,14 +7,55 @@
 **
 **	char	*ft_substr(char const *s, unsigned int start, size_t len);
 **
+**	char	*ft_strdup(const char *src)
+**	{
+**		int		i;
+**		char	*str;
+**
+**		i = 0;
+**		while (src[i] != '\0')
+**			i++;
+**		if (!(str = (char*)malloc(sizeof(*str) * (i + 1))))
+**			return (NULL);
+**		while (i-- >= 0)
+**			str[i + 1] = src[i + 1];
+**		return (str);
+**	}
+**
+**	int		ft_strncmp(const char *s1, const char *s2, size_t n)
+**	{
+**		size_t	i;
+**		int		res;
+**
+**		i = 0;
+**		res = 0;
+**		while (s1[i] && s1[i] == s2[i] && i < n - 1)
+**			i++;
+**		if (n != 0)
+**			res = (unsigned char)s1[i] - (unsigned char)s2[i];
+**		return (res);
+**	}
+**
+**	size_t		ft_strlen(const char *str)
+**	{
+**		size_t i;
+**
+**		i = 0;
+**		while (str[i])
+**			i++;
+**		return (i);
+**	}
+**
 **	int		main(int ac, char **av)
 **	{
 **		char	*str;
 **
-**		if (ac != 4)
-**			return (0);
-**		str = ft_substr(av[1], atoi(av[2]), atoi(av[3]));
-**		printf("%s\n",str);
+**		str = "";
+**		size_t	size = 0;
+**		char	*ret = ft_substr(str, 5, size);
+**		if (!ft_strncmp(ret, str + 5, size))
+**			printf("gloups\n");
+**		free(ret);
 **		return (0);
 **	}
 */
@@ -41,7 +70,7 @@ char	*ft_substr(char const *s, unsigned int start, size_t len)
 	if (!s)
 		return (NULL);
 	if (ft_strlen(s) < start)
-		return ("");
+		return (ft_strdup(""));
 	if (!(str = (char *)malloc(sizeof(char) * (len + 1))))
 		return (NULL);
 	i = 0;
diff --git a/srcs/ft_strdup.c b/srcs/ft_strdup.c
index b917ac9..b159a1c 100644
--- a/srcs/ft_strdup.c
+++ b/srcs/ft_strdup.c
@@ -6,7 +6,7 @@
 /*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/11/25 13:56:54 by hulamy            #+#    #+#             */
-/*   Updated: 2019/11/25 13:56:55 by hulamy           ###   ########.fr       */
+/*   Updated: 2019/11/28 16:24:25 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
diff --git a/srcs/ft_substr.c b/srcs/ft_substr.c
index 3ea3480..091545d 100644
--- a/srcs/ft_substr.c
+++ b/srcs/ft_substr.c
@@ -6,7 +6,7 @@
 /*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/11/25 14:01:58 by hulamy            #+#    #+#             */
-/*   Updated: 2019/11/27 19:54:09 by hulamy           ###   ########.fr       */
+/*   Updated: 2019/11/28 16:32:34 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -41,7 +41,7 @@ char	*ft_substr(char const *s, unsigned int start, size_t len)
 	if (!s)
 		return (NULL);
 	if (ft_strlen(s) < start)
-		return ("");
+		return (ft_strdup(""));
 	if (!(str = (char *)malloc(sizeof(char) * (len + 1))))
 		return (NULL);
 	i = 0;