diff --git a/Makefile b/Makefile
index cc92334..e40e196 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@
 #    By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2023/11/01 11:03:22 by adjoly            #+#    #+#              #
-#    Updated: 2023/11/05 10:48:31 by adjoly           ###   ########.fr        #
+#    Updated: 2023/11/05 14:57:25 by adjoly           ###   ########.fr        #
 #                                                                              #
 # **************************************************************************** #
 
@@ -20,6 +20,7 @@ SRCS = ft_atoi.c \
 		ft_isalpha.c \
 		ft_isascii.c \
 		ft_isdigit.c \
+		ft_isprint.c \
 		ft_putchar_fd.c \
 		ft_putnbr_fd.c \
 		ft_putstr_fd.c \
@@ -34,6 +35,7 @@ SRCS = ft_atoi.c \
 		ft_strlcat.c \
 		ft_strjoin.c \
 		ft_strncmp.c \
+		ft_strchr.c \
 	
 OBJS = $(SRCS:.c=.o)
 
diff --git a/ft_isprint.c b/ft_isprint.c
new file mode 100644
index 0000000..e21f334
--- /dev/null
+++ b/ft_isprint.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_isprint.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/11/05 14:47:49 by adjoly            #+#    #+#             */
+/*   Updated: 2023/11/05 14:51:51 by adjoly           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_isprint(int c)
+{
+	if (c >= 32 && c <= 126)
+		return (1);
+	return (0);
+}
diff --git a/ft_memchr.c b/ft_memchr.c
new file mode 100644
index 0000000..abccd56
--- /dev/null
+++ b/ft_memchr.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memchr.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/11/05 14:52:53 by adjoly            #+#    #+#             */
+/*   Updated: 2023/11/05 14:54:57 by adjoly           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+void	*ft_memchr(const void *s, int c, size_t n)
+{
+	
+}
diff --git a/ft_memmove.c b/ft_memmove.c
index bc2ebdf..a5dba16 100644
--- a/ft_memmove.c
+++ b/ft_memmove.c
@@ -6,7 +6,7 @@
 /*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/11/03 15:04:04 by adjoly            #+#    #+#             */
-/*   Updated: 2023/11/03 15:57:15 by adjoly           ###   ########.fr       */
+/*   Updated: 2023/11/05 14:52:24 by adjoly           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
diff --git a/ft_putstr_fd.c b/ft_putstr_fd.c
index 1f63bff..2b23b47 100644
--- a/ft_putstr_fd.c
+++ b/ft_putstr_fd.c
@@ -6,7 +6,7 @@
 /*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/10/31 11:45:55 by adjoly            #+#    #+#             */
-/*   Updated: 2023/11/01 17:14:02 by adjoly           ###   ########.fr       */
+/*   Updated: 2023/11/05 15:06:13 by adjoly           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -17,6 +17,8 @@ void	ft_putstr_fd(char *s, int fd)
 	int	i;
 
 	i = 0;
+	if (s == NULL)
+		return ;
 	while (s[i])
 	{
 		write(fd, &s[i], 1);
diff --git a/ft_strchr.c b/ft_strchr.c
index 6cf9679..5af9f0f 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: 2023/11/04 15:32:14 by adjoly           ###   ########.fr       */
+/*   Updated: 2023/11/05 14:59:50 by adjoly           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -15,9 +15,10 @@ char	*ft_strchr(const char *s, int c)
 	int		i;
 	int		j;
 	char	*str_result;
-// initialize str_result
+
 	i = 0;
 	j = 0;
+	str_result = 0;
 	while (s[i] != c || s[i])
 		i++;
 	if (s[i] == c)
diff --git a/ft_strncmp.c b/ft_strncmp.c
new file mode 100644
index 0000000..656bd37
--- /dev/null
+++ b/ft_strncmp.c
@@ -0,0 +1,23 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strncmp.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/11/05 10:40:45 by adjoly            #+#    #+#             */
+/*   Updated: 2023/11/05 11:02:33 by adjoly           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+int	ft_strncmp(const char *s1, const char *s2, size_t	n)
+{
+	size_t	i;
+
+	i = 0;
+	while (s1[i] && s2[i] && i < n && s1[i] != s2[i])
+		i++;
+	return (s1[i] - s2[i]);
+}
diff --git a/libft.h b/libft.h
index 999a2f9..d345c6d 100644
--- a/libft.h
+++ b/libft.h
@@ -6,13 +6,14 @@
 /*   By: adjoly <adjoly@student.42.fr>              +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/11/01 10:06:03 by adjoly            #+#    #+#             */
-/*   Updated: 2023/11/05 10:48:55 by adjoly           ###   ########.fr       */
+/*   Updated: 2023/11/05 14:57:55 by adjoly           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #ifndef LIBFT_H
 # define LIBFT_H
 
+#include <complex.h>
 # include <stddef.h>
 # include <stdlib.h>
 # include <unistd.h>
@@ -40,5 +41,7 @@ int		ft_toupper(int c);
 size_t	ft_strlcat(char *dst, const char *src, size_t size);
 char	*ft_strjoin(char const *s1, char const *s2);
 int		ft_strncmp(const char *s1, const char *s2, size_t n);
+int		ft_isprint(int c);
+void	*memchr(const void *s, int c, size_t n);
 
 #endif
\ No newline at end of file
diff --git a/libft.so b/libft.so
index fad2400..c082c23 100755
Binary files a/libft.so and b/libft.so differ