diff --git a/srcs/bonus/a.out b/srcs/bonus/a.out
new file mode 100755
index 0000000..f43beac
Binary files /dev/null and b/srcs/bonus/a.out differ
diff --git a/srcs/bonus/ft_lstadd_back.c b/srcs/bonus/ft_lstadd_back.c
new file mode 100644
index 0000000..bfaf6ee
--- /dev/null
+++ b/srcs/bonus/ft_lstadd_back.c
@@ -0,0 +1,13 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_lstadd_back.c                                   :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2019/11/20 15:14:22 by hulamy            #+#    #+#             */
+/*   Updated: 2019/11/20 15:14:35 by hulamy           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
diff --git a/srcs/bonus/ft_lstlast.c b/srcs/bonus/ft_lstlast.c
new file mode 100644
index 0000000..f23df41
--- /dev/null
+++ b/srcs/bonus/ft_lstlast.c
@@ -0,0 +1,13 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_lstlast.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2019/11/20 15:13:43 by hulamy            #+#    #+#             */
+/*   Updated: 2019/11/20 15:13:58 by hulamy           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
diff --git a/srcs/bonus/ft_lstnew.c b/srcs/bonus/ft_lstnew.c
index 6d00337..c311307 100644
--- a/srcs/bonus/ft_lstnew.c
+++ b/srcs/bonus/ft_lstnew.c
@@ -6,29 +6,71 @@
 /*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2018/11/14 21:11:42 by hulamy            #+#    #+#             */
-/*   Updated: 2018/11/16 14:01:36 by hulamy           ###   ########.fr       */
+/*   Updated: 2019/11/20 16:39:29 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+/*
+**	create a new list
+*/
+
+/*	
+**	#include <libc.h>
+**	
+**	void	*ft_memcpy(void *dst, const void *src, size_t n)
+**	{
+**		size_t	i;
+**		char	*ptr;
+**		char	*ptr2;
+**	
+**		ptr = (char *)dst;
+**		ptr2 = (char *)src;
+**		i = -1;
+**		while (++i < n)
+**			ptr[i] = ptr2[i];
+**		return (dst);
+**	}
+**	
+**	typedef struct		s_list
+**	{
+**		void			*content;
+**		struct s_list	*next;
+**	}					t_list;
+**	
+**	t_list	*ft_lstnew(void *content);
+**	
+**	int	main(void)
+**	{
+**		char	tresor;
+**		t_list	*toto;
+**	
+**		tresor = 'd';
+**		printf("tresor               : %c\n",tresor);
+**		toto = ft_lstnew(&tresor);
+**		//toto->content was alocated as void* so it need cast
+**		printf("toto->content        : %c\n",*(char*)(toto->content));	
+**		tresor = 'D';
+**		printf("transform tresor     : %c\n",tresor);
+**		printf("but not toto->content: %c\n",*(char*)(toto->content));	
+**		return (0);
+**	}
+*/	
+
 #include "libft.h"
 
-t_list	*ft_lstnew(void const *content, size_t content_size)
+t_list	*ft_lstnew(void *content)
 {
 	t_list		*lst;
 
 	if (!(lst = (t_list *)malloc(sizeof(*lst))))
 		return (NULL);
 	if (!content)
-	{
 		lst->content = NULL;
-		lst->content_size = 0;
-	}
 	else
 	{
-		if (!(lst->content = malloc(content_size)))
+		if (!(lst->content = malloc(sizeof(content))))
 			return (NULL);
-		ft_memcpy(lst->content, content, content_size);
-		lst->content_size = content_size;
+		ft_memcpy(lst->content, content, sizeof(content));
 	}
 	lst->next = NULL;
 	return (lst);
diff --git a/srcs/bonus/ft_lstsize.c b/srcs/bonus/ft_lstsize.c
new file mode 100644
index 0000000..23a356c
--- /dev/null
+++ b/srcs/bonus/ft_lstsize.c
@@ -0,0 +1,14 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_lstsize.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2019/11/20 15:12:55 by hulamy            #+#    #+#             */
+/*   Updated: 2019/11/20 15:13:11 by hulamy           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+