diff --git a/ft_atoi.o b/ft_atoi.o
new file mode 100644
index 0000000..afb0010
Binary files /dev/null and b/ft_atoi.o differ
diff --git a/ft_bzero.o b/ft_bzero.o
new file mode 100644
index 0000000..62d7f17
Binary files /dev/null and b/ft_bzero.o differ
diff --git a/ft_calloc.o b/ft_calloc.o
new file mode 100644
index 0000000..060138b
Binary files /dev/null and b/ft_calloc.o differ
diff --git a/ft_isalnum.o b/ft_isalnum.o
new file mode 100644
index 0000000..aecf709
Binary files /dev/null and b/ft_isalnum.o differ
diff --git a/ft_isalpha.o b/ft_isalpha.o
new file mode 100644
index 0000000..0bd62e8
Binary files /dev/null and b/ft_isalpha.o differ
diff --git a/ft_isascii.o b/ft_isascii.o
new file mode 100644
index 0000000..11cdcbf
Binary files /dev/null and b/ft_isascii.o differ
diff --git a/ft_isdigit.o b/ft_isdigit.o
new file mode 100644
index 0000000..9473b5f
Binary files /dev/null and b/ft_isdigit.o differ
diff --git a/ft_isprint.o b/ft_isprint.o
new file mode 100644
index 0000000..fa1d564
Binary files /dev/null and b/ft_isprint.o differ
diff --git a/ft_itoa.o b/ft_itoa.o
new file mode 100644
index 0000000..9d54483
Binary files /dev/null and b/ft_itoa.o differ
diff --git a/ft_memchr.c b/ft_memchr.c
index c6c91ff..188a661 100644
--- a/ft_memchr.c
+++ b/ft_memchr.c
@@ -6,26 +6,22 @@
 /*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/11/05 14:52:53 by adjoly            #+#    #+#             */
-/*   Updated: 2023/11/08 14:52:06 by adjoly           ###   ########.fr       */
+/*   Updated: 2023/11/09 14:27:32 by adjoly           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "libft.h"
 
-#define BUFFER_SIZE 10
-
 void	*ft_memchr(const void *s, int c, size_t n)
 {
 	size_t	i;
 
 	i = 0;
-	while (((char *)s)[i] && i < n)
+	while (i < n)
 	{
-		if (((char *)s)[i] == (char)c)
-			return (((char *)s + i));
+		if (((unsigned char *)s)[i] == (unsigned char)c)
+			return (((void *)s + i));
 		i++;
 	}
-	if (c == 0)
-		return (((char *)s) + i);
 	return (NULL);
 }
diff --git a/ft_memchr.o b/ft_memchr.o
new file mode 100644
index 0000000..be0211d
Binary files /dev/null and b/ft_memchr.o differ
diff --git a/ft_memcmp.c b/ft_memcmp.c
index 5484b9e..9da23a1 100644
--- a/ft_memcmp.c
+++ b/ft_memcmp.c
@@ -6,7 +6,7 @@
 /*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/11/08 12:04:48 by adjoly            #+#    #+#             */
-/*   Updated: 2023/11/08 12:16:47 by adjoly           ###   ########.fr       */
+/*   Updated: 2023/11/09 14:06:17 by adjoly           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -18,6 +18,8 @@ int	ft_memcmp(const void *s1, const void *s2, size_t n)
 	size_t	i;
 
 	i = 0;
+	if (n == 0)
+		return (0);
 	while (((unsigned char *)s1)[i] == ((unsigned char *)s2)[i] && i < n - 1)
 		i++;
 	return (((unsigned char *)s1)[i] - ((unsigned char *)s2)[i]);
diff --git a/ft_memcmp.o b/ft_memcmp.o
new file mode 100644
index 0000000..f6e2703
Binary files /dev/null and b/ft_memcmp.o differ
diff --git a/ft_memcpy.o b/ft_memcpy.o
new file mode 100644
index 0000000..6fec394
Binary files /dev/null and b/ft_memcpy.o differ
diff --git a/ft_memmove.o b/ft_memmove.o
new file mode 100644
index 0000000..02381d8
Binary files /dev/null and b/ft_memmove.o differ
diff --git a/ft_memset.o b/ft_memset.o
new file mode 100644
index 0000000..936618d
Binary files /dev/null and b/ft_memset.o differ
diff --git a/ft_putchar_fd.o b/ft_putchar_fd.o
new file mode 100644
index 0000000..786101f
Binary files /dev/null and b/ft_putchar_fd.o differ
diff --git a/ft_putnbr_fd.o b/ft_putnbr_fd.o
new file mode 100644
index 0000000..82110de
Binary files /dev/null and b/ft_putnbr_fd.o differ
diff --git a/ft_putstr_fd.o b/ft_putstr_fd.o
new file mode 100644
index 0000000..ed9d76c
Binary files /dev/null and b/ft_putstr_fd.o differ
diff --git a/ft_strchr.c b/ft_strchr.c
index 2a967e2..2016b39 100644
--- a/ft_strchr.c
+++ b/ft_strchr.c
@@ -6,7 +6,7 @@
 /*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/11/01 15:45:18 by adjoly            #+#    #+#             */
-/*   Updated: 2023/11/08 14:31:21 by adjoly           ###   ########.fr       */
+/*   Updated: 2023/11/09 14:31:55 by adjoly           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -19,5 +19,7 @@ char	*ft_strchr(const char *s, int c)
 
 	len_s = ft_strlen(s);
 	result = ft_memchr(s, c, len_s);
+	if (c == 0)
+		return ((char *)s + len_s);
 	return (result);
 }
diff --git a/ft_strchr.o b/ft_strchr.o
new file mode 100644
index 0000000..c5583ff
Binary files /dev/null and b/ft_strchr.o differ
diff --git a/ft_strdup.o b/ft_strdup.o
new file mode 100644
index 0000000..5c511ad
Binary files /dev/null and b/ft_strdup.o differ
diff --git a/ft_strjoin.o b/ft_strjoin.o
new file mode 100644
index 0000000..84cbaa5
Binary files /dev/null and b/ft_strjoin.o differ
diff --git a/ft_strlcat.o b/ft_strlcat.o
new file mode 100644
index 0000000..fffbf92
Binary files /dev/null and b/ft_strlcat.o differ
diff --git a/ft_strlcpy.o b/ft_strlcpy.o
new file mode 100644
index 0000000..e25b437
Binary files /dev/null and b/ft_strlcpy.o differ
diff --git a/ft_strlen.o b/ft_strlen.o
new file mode 100644
index 0000000..0bbb64d
Binary files /dev/null and b/ft_strlen.o differ
diff --git a/ft_strncmp.o b/ft_strncmp.o
new file mode 100644
index 0000000..1f797d9
Binary files /dev/null and b/ft_strncmp.o differ
diff --git a/ft_strnstr.c b/ft_strnstr.c
new file mode 100644
index 0000000..3a385bc
--- /dev/null
+++ b/ft_strnstr.c
@@ -0,0 +1,36 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strnstr.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/11/08 16:02:17 by adjoly            #+#    #+#             */
+/*   Updated: 2023/11/09 13:58:30 by adjoly           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+char	*ft_strnstr(const char *big, const char *little, size_t len)
+{
+	size_t	i;
+	size_t	j;
+
+	i = 0;
+	j = 0;
+	if (!little || big == little)
+		return ((char *)big);
+	if (len <= 0)
+		return (0);
+	while (i < len && big[i])
+	{
+		j = 0;
+		while (i + j < len && big[i + j] == little[j])
+			j++;
+		if (little[j] == 0)
+			return ((char *)big + i);
+		i++;
+	}
+	return (NULL);
+}
diff --git a/ft_strnstr.o b/ft_strnstr.o
new file mode 100644
index 0000000..c975132
Binary files /dev/null and b/ft_strnstr.o differ
diff --git a/ft_strrchr.c b/ft_strrchr.c
new file mode 100644
index 0000000..d77e573
--- /dev/null
+++ b/ft_strrchr.c
@@ -0,0 +1,33 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strrchr.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/11/08 14:44:26 by adjoly            #+#    #+#             */
+/*   Updated: 2023/11/08 15:21:28 by adjoly           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+char	*ft_strrchr(const char *s, int c)
+{
+	size_t	i;
+	size_t	len_s;
+
+	len_s = ft_strlen(s);
+	i = len_s;
+	if (c == 0)
+		return (&((char *)s)[len_s]);
+	while (i > 0)
+	{
+		if (s[i] == (char)c)
+			return (&((char *)s)[i]);
+		i--;
+	}
+	if (s[0] == (char)c)
+		return (&((char *)s)[0]);
+	return (NULL);
+}
diff --git a/ft_strrchr.o b/ft_strrchr.o
new file mode 100644
index 0000000..aa9ce75
Binary files /dev/null and b/ft_strrchr.o differ
diff --git a/ft_substr.c b/ft_substr.c
index 7b02b8e..c6d5b1d 100644
--- a/ft_substr.c
+++ b/ft_substr.c
@@ -6,7 +6,7 @@
 /*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/11/02 17:59:58 by adjoly            #+#    #+#             */
-/*   Updated: 2023/11/05 12:14:35 by adjoly           ###   ########.fr       */
+/*   Updated: 2023/11/09 15:02:46 by adjoly           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -18,15 +18,14 @@ char	*ft_substr(char const *s, unsigned int start, size_t len)
 	char	*result;
 
 	i = 0;
-	if (s == NULL || len == 0)
+	if (s == NULL)
 		return (NULL);
-	if (start >= ft_strlen(s))
+	if (start > ft_strlen(s))
 	{
-		result = malloc(1);
-		result[0] = '\0';
+		result = calloc(1, 1);
 		return (result);
 	}
-	result = malloc((len + 1) * sizeof(char));
+	result = malloc(((ft_strlen(s) - len) + 1) * sizeof(char));
 	if (result == NULL)
 		return (NULL);
 	while (i < len && s[start + i])
diff --git a/ft_substr.o b/ft_substr.o
new file mode 100644
index 0000000..f8e0888
Binary files /dev/null and b/ft_substr.o differ
diff --git a/ft_tolower.o b/ft_tolower.o
new file mode 100644
index 0000000..9fde8fe
Binary files /dev/null and b/ft_tolower.o differ
diff --git a/ft_toupper.o b/ft_toupper.o
new file mode 100644
index 0000000..374dad9
Binary files /dev/null and b/ft_toupper.o differ
diff --git a/libft.a b/libft.a
new file mode 100644
index 0000000..0b6b1d7
Binary files /dev/null and b/libft.a differ