diff --git a/Makefile b/Makefile
index 5c56f78..6448387 100644
--- a/Makefile
+++ b/Makefile
@@ -4,15 +4,37 @@ AR			= ar
 
 ARFLAGS		= rc
 
-CFLAGS		= -Wall -Wextra -Werror -I libft.h
+HEADER		= libft.h
+
+CFLAGS		= -Wall -Wextra -Werror
 
 NAME		= libft.a
 
-SRC			= ft_isalpha.c ft_isdigit.c ft_isalnum.c ft_isascii.c
+SRC			= ft_isalpha.c \
+			  ft_isdigit.c \
+			  ft_isalnum.c \
+			  ft_isascii.c \
+			  ft_isprint.c \
+			  ft_strlen.c \
+			  ft_memset.c \
+			  ft_bzero.c \
+			  ft_memcpy.c \
+			  ft_memmove.c \
+			  ft_strlcpy.c \
+			  ft_strlcat.c \
+			  ft_toupper.c \
+			  ft_tolower.c \
+			  ft_strchr.c \
+			  ft_strrchr.c \
+			  ft_strncmp.c \
+			  ft_memcpy.c \
+			  ft_memchr.c \
+			  ft_strnstr.c \
+			  ft_atoi.c
 
-OBJDIR		= objs
+OBJ_DIR		= objs
 
-OBJ			= $(patsubst %, $(OBJDIR)/%o, $(SRC:.c=.))
+OBJ			= $(patsubst %, $(OBJ_DIR)/%o, $(SRC:.c=.))
 
 
 all: 		$(NAME)
@@ -21,10 +43,10 @@ $(NAME):	$(OBJ)
 			$(AR) $(ARFLAGS) $(NAME) $(OBJ)
 			ranlib $(NAME)
 
-$(OBJDIR)/%.o:		%.c | $(OBJDIR)
-			$(CC) -o $@ -c $< $(CFLAGS)
+$(OBJ_DIR)/%.o:		%.c | $(OBJ_DIR)
+			$(CC) -o $@ -c $< $(CFLAGS) -I$(HEADER)
 
-$(OBJDIR):
+$(OBJ_DIR):
 			mkdir $@
 
 clean:
@@ -35,4 +57,4 @@ fclean:		clean
 
 re:			fclean all
 
-.PHONY:		all clean fclean re 
+.PHONY:		all clean fclean re
diff --git a/ft_atoi.c b/ft_atoi.c
new file mode 100644
index 0000000..55fbfe1
--- /dev/null
+++ b/ft_atoi.c
@@ -0,0 +1,29 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_atoi.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 19:07:51 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 19:17:34 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+int	ft_atoi(const char *nptr)
+{
+	int	i;
+	int	res;
+
+	i = 0;
+	res = 0;
+	if (!nptr[0])
+		return (0);
+	if (nptr[0] == '-' && ft_isdigit(nptr[1]))
+		return (-1 * ft_atoi(nptr + 1));
+	while (ft_isdigit(nptr[i++]))
+		res = (10 * res) + (nptr[i] - '0');
+	return (res);
+}
diff --git a/ft_bzero.c b/ft_bzero.c
new file mode 100644
index 0000000..ff3ccb3
--- /dev/null
+++ b/ft_bzero.c
@@ -0,0 +1,21 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_bzero.c                                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 11:41:08 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 11:44:03 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+void	ft_bzero(void *s, size_t n)
+{
+	if (n <= 0)
+		return ;
+	*((char *) s) = '\0';
+	ft_bzero(s + 1, n - 1);
+}
diff --git a/ft_isprint.c b/ft_isprint.c
new file mode 100644
index 0000000..9e0c39a
--- /dev/null
+++ b/ft_isprint.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_isprint.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 11:14:13 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 11:16:46 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_isprint(int c)
+{
+	if ((c >= 40 && c <= 126) || (c >= 7 && c <= 13))
+		return (1);
+	return (0);
+}
diff --git a/ft_memchr.c b/ft_memchr.c
new file mode 100644
index 0000000..03dc996
--- /dev/null
+++ b/ft_memchr.c
@@ -0,0 +1,22 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memchr.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 17:54:17 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 17:59:54 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+void	*ft_memchr(const void *s, int c, size_t n)
+{
+	if (n > 0 && *((unsigned char *) s) == c)
+		return ((void *) s);
+	if (n <= 0)
+		return (NULL);
+	return (ft_memchr(s + 1, c, n - 1));
+}
diff --git a/ft_memcmp.c b/ft_memcmp.c
new file mode 100644
index 0000000..804eb20
--- /dev/null
+++ b/ft_memcmp.c
@@ -0,0 +1,22 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memcmp.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 18:00:38 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 18:05:28 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+int	ft_memcmp(const void *s1, const void *s2, size_t n)
+{
+	if (n <= 0)
+		return (0);
+	if (*((unsigned char *) s1) != *((unsigned char *) s2))
+		return (*((unsigned char *) s1) - *((unsigned char *) s2));
+	return (ft_memcmp(s1 + 1, s2 + 1, n - 1));
+}
diff --git a/ft_memcpy.c b/ft_memcpy.c
new file mode 100644
index 0000000..4144b38
--- /dev/null
+++ b/ft_memcpy.c
@@ -0,0 +1,22 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memcpy.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 11:46:16 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 17:02:06 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+void	*ft_memcpy(void *dest, const void *src, size_t n)
+{
+	if (n <= 0)
+		return (dest);
+	*((unsigned char *) dest) = *((unsigned char *) src);
+	ft_memcpy(dest + 1, src + 1, n - 1);
+	return (dest);
+}
diff --git a/ft_memmove.c b/ft_memmove.c
new file mode 100644
index 0000000..98ab7bd
--- /dev/null
+++ b/ft_memmove.c
@@ -0,0 +1,33 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memmove.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 13:17:42 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 13:27:43 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+void	*ft_rev_memcpy(void *dest, const void *src, size_t n)
+{
+	if (n <= 0)
+	{
+		return (dest);
+	}
+	*((char *) dest) = *((char *) src);
+	ft_memcpy(dest - 1, src - 1, n - 1);
+	return (dest);
+}
+
+void	*ft_memmove(void *dest, const void *src, size_t n)
+{
+	if (dest < src)
+		ft_memcpy(dest, src, n);
+	else
+		ft_rev_memcpy(dest + n, src + n, n);
+	return (dest);
+}
diff --git a/ft_memset.c b/ft_memset.c
new file mode 100644
index 0000000..ee59ed0
--- /dev/null
+++ b/ft_memset.c
@@ -0,0 +1,22 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memset.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 11:20:47 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 11:44:56 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+void	*ft_memset(void *s, int c, size_t n)
+{
+	if (n <= 0)
+		return (s);
+	*((char *) s) = c;
+	ft_memset(s + 1, c, n - 1);
+	return (s);
+}
diff --git a/ft_strchr.c b/ft_strchr.c
new file mode 100644
index 0000000..1d817b6
--- /dev/null
+++ b/ft_strchr.c
@@ -0,0 +1,20 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strchr.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 17:24:37 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 17:38:39 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+char	*ft_strchr(const char *s, int c)
+{
+	if (*s == c)
+		return ((char *) s);
+	if (!(*s))
+		return (0);
+	return (ft_strchr(s + 1, c));
+}
diff --git a/ft_strlcat.c b/ft_strlcat.c
new file mode 100644
index 0000000..9fc426e
--- /dev/null
+++ b/ft_strlcat.c
@@ -0,0 +1,26 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strlcat.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 17:11:43 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 17:19:16 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+size_t	ft_strlcpy(char *dst, const char *src, size_t size)
+{
+	size_t	i;
+	size_t	j;
+
+	i = 0;
+	j = ft_strlen(dst);
+	while (i < (size - 1) && src[i++])
+		dst[i + j] = src[i];
+	dst[i + j] = '\0';
+	return (j + ft_strlen(dst));
+}
diff --git a/ft_strlcpy.c b/ft_strlcpy.c
new file mode 100644
index 0000000..ed60ea6
--- /dev/null
+++ b/ft_strlcpy.c
@@ -0,0 +1,24 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strlcpy.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 13:31:13 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 17:10:52 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+size_t	ft_strlcpy(char *dst, const char *src, size_t size)
+{
+	size_t	i;
+
+	i = 0;
+	while (src[i++] && size > (i - 1))
+		dst[i] = src[i];
+	dst[i] = '\0';
+	return (ft_strlen(src));
+}
diff --git a/ft_strlen.c b/ft_strlen.c
new file mode 100644
index 0000000..aa82e97
--- /dev/null
+++ b/ft_strlen.c
@@ -0,0 +1,20 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strlen.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 11:17:31 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 11:20:00 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+size_t	ft_strlen(const char *s)
+{
+	if (!(*s))
+		return (0);
+	return (1 + ft_strlen(s + 1));
+}
diff --git a/ft_strncmp.c b/ft_strncmp.c
new file mode 100644
index 0000000..5428d76
--- /dev/null
+++ b/ft_strncmp.c
@@ -0,0 +1,22 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strncmp.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 17:34:15 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 17:41:35 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+int	ft_strncmp(const char *s1, const char *s2, size_t n)
+{
+	if (n <= 0)
+		return (0);
+	if (*s1 != *s2)
+		return (*s1 - *s2);
+	return (ft_strncmp(s1 + 1, s2 + 1, n - 1));
+}
diff --git a/ft_strnstr.c b/ft_strnstr.c
new file mode 100644
index 0000000..738ec32
--- /dev/null
+++ b/ft_strnstr.c
@@ -0,0 +1,31 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   strnstr.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 18:05:52 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 19:07:15 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+char	*ft_strnstr(const char *big, const char *little, size_t len)
+{
+	size_t	little_len;
+	size_t	i;
+
+	i = 0;
+	little_len = ft_strlen(little);
+	if (!little[0])
+		return ((char *) big);
+	while ((len - i) < little_len)
+	{
+		if (!ft_strncmp(&big[i], little, little_len))
+			return ((char *) &big[i]);
+		i++;
+	}
+	return (NULL);
+}
diff --git a/ft_strrchr.c b/ft_strrchr.c
new file mode 100644
index 0000000..0ec6855
--- /dev/null
+++ b/ft_strrchr.c
@@ -0,0 +1,27 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strrchr.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 17:28:39 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 17:33:38 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+char	*ft_strrchr(const char *s, int c)
+{
+	int	i;
+
+	i = 0;
+	while (s[i])
+		i++;
+	while (i >= 0)
+	{
+		if (s[i] == c)
+			return ((char *) &s[i]);
+		i++;
+	}
+	return (0);
+}
diff --git a/ft_tolower.c b/ft_tolower.c
new file mode 100644
index 0000000..14a5d34
--- /dev/null
+++ b/ft_tolower.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_tolower.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 17:23:29 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 17:24:21 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_tolower(int c)
+{
+	if (c >= 'A' && c <= 'Z')
+		return (c + 32);
+	return (c);
+}
diff --git a/ft_toupper.c b/ft_toupper.c
new file mode 100644
index 0000000..5f70504
--- /dev/null
+++ b/ft_toupper.c
@@ -0,0 +1,18 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_toupper.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/05 17:20:43 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/05 17:23:02 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_toupper(int c)
+{
+	if (c >= 'a' && c <= 'z')
+		return (c - 32);
+	return (c);
+}
diff --git a/libft.h b/libft.h
index df71a96..b9b626a 100644
--- a/libft.h
+++ b/libft.h
@@ -6,7 +6,7 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/05 09:49:43 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/11/05 10:55:45 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/11/05 19:06:38 by dgaillet         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -15,9 +15,24 @@
 
 # include <stdlib.h>
 
-int	ft_isalpha(int c);
-int	ft_isdigit(int c);
-int	ft_isalnum(int c);
-int	ft_isascii(int c);
+int		ft_isalpha(int c);
+int		ft_isdigit(int c);
+int		ft_isalnum(int c);
+int		ft_isascii(int c);
+int		ft_isprint(int c);
+size_t	ft_strlen(const char *s);
+void	*ft_memset(void *s, int c, size_t n);
+void	ft_bzero(void *s, size_t n);
+void	*ft_memcpy(void *dest, const void *src, size_t n);
+void	*ft_memmove(void *dest, const void *src, size_t n);
+size_t	ft_strlcpy(char *dst, const char *src, size_t size);
+size_t	ft_strlcat(char *dst, const char *src, size_t size);
+int		ft_toupper(int c);
+int		ft_tolower(int c);
+char	*ft_strchr(const char *s, int c);
+char	*ft_strrchr(const char *s, int c);
+int		ft_strncmp(const char *s1, const char *s2, size_t n);
+int		ft_memcmp(const void *s1, const void *s2, size_t n);
+void	*ft_memchr(const void *s, int c, size_t n);
 
 #endif