diff --git a/ft_lstadd_back_bonus.c b/ft_lstadd_back_bonus.c
index 69752fa..612037e 100644
--- a/ft_lstadd_back_bonus.c
+++ b/ft_lstadd_back_bonus.c
@@ -6,7 +6,7 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/09 15:06:49 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/11/10 18:18:38 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/11/11 15:20:02 by dgaillet         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -21,8 +21,6 @@ void	ft_lstadd_back(t_list **lst, t_list *new)
 		*lst = new;
 		return ;
 	}
-	temp = *lst;
-	while (temp->next)
-		temp = temp->next;
+	temp = ft_lstlast(*lst);
 	temp->next = new;
 }
diff --git a/ft_lstadd_front_bonus.c b/ft_lstadd_front_bonus.c
index f722500..930eed9 100644
--- a/ft_lstadd_front_bonus.c
+++ b/ft_lstadd_front_bonus.c
@@ -6,7 +6,7 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/09 14:36:17 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/11/10 18:18:46 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/11/11 15:26:21 by dgaillet         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,6 +14,19 @@
 
 void	ft_lstadd_front(t_list **lst, t_list *new)
 {
+	if (!new || !lst)
+		return ;
 	new->next = *lst;
 	*lst = new;
 }
+
+int	main(void)
+{
+	t_list	*ptr;
+	t_list	*lst[1];
+
+	ptr = ft_lstnew(NULL);
+	lst[0] = NULL;
+	ft_lstadd_front(lst, ptr);
+	free(ptr);
+}
diff --git a/ft_lstlast_bonus.c b/ft_lstlast_bonus.c
index b6b69b0..5bdd57c 100644
--- a/ft_lstlast_bonus.c
+++ b/ft_lstlast_bonus.c
@@ -6,7 +6,7 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/09 15:03:19 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/11/10 18:19:16 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/11/11 15:18:37 by dgaillet         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,9 +14,17 @@
 
 t_list	*ft_lstlast(t_list *lst)
 {
+	size_t	size;
+	size_t	i;
+
 	if (!lst)
 		return (NULL);
-	while (lst->next)
+	size = ft_lstsize(lst);
+	i = 1;
+	while (i < size)
+	{
 		lst = lst->next;
+		i++;
+	}
 	return (lst);
 }