diff --git a/push_swap.h b/push_swap.h
index 2c4d8cd..c93124d 100644
--- a/push_swap.h
+++ b/push_swap.h
@@ -6,7 +6,7 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/12/08 14:18:06 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/12/08 14:39:22 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/12/08 15:34:51 by mteriier         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -26,4 +26,17 @@ typedef struct s_stacks
 	t_stack	*b;
 }	t_stacks;
 
+/*STACK_FUNCTIONS*/
+void	pa(t_stacks *stacks);
+void	pb(t_stacks *stacks);
+void	rra(t_stacks *stacks);
+void	rrb(t_stacks *stacks);
+void	rrr(t_stacks *stacks);
+void	ra(t_stacks *stacks);
+void	rb(t_stacks *stacks);
+void	rr(t_stacks *stacks);
+void	sa(t_stacks *stacks);
+void	sb(t_stacks *stacks);
+void	ss(t_stacks *stacks);
+
 #endif
diff --git a/stack_functions/push.c b/stack_functions/push.c
new file mode 100644
index 0000000..ec8944e
--- /dev/null
+++ b/stack_functions/push.c
@@ -0,0 +1,33 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   push.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: mteriier <mteriier@student.42lyon.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/08 15:09:40 by mteriier          #+#    #+#             */
+/*   Updated: 2025/12/08 15:35:23 by mteriier         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+
+void	pa(t_stacks *stacks)
+{
+	t_stack	a;
+
+	if (!stacks || !stacks->b)
+		return ;
+	a = stack->a;
+	a->value = stacks->b->value;
+}
+
+void	pb(t_stacks *stacks)
+{
+	t_stack	b;
+
+	if (!stacks || !stacks->a)
+		return ;
+	b = stacks->b;
+	b->value = stacks->a->value;
+}
diff --git a/stack_functions/rev_rotate.c b/stack_functions/rev_rotate.c
new file mode 100644
index 0000000..fe9e664
--- /dev/null
+++ b/stack_functions/rev_rotate.c
@@ -0,0 +1,31 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   rev_rotate.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/08 14:43:45 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/12/08 14:52:53 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+
+void	rra(t_stacks *stacks)
+{
+	if (stacks && stacks->a && stacks->a->previous)
+		stacks->a = stacks->a->previous;
+}
+
+void	rrb(t_stacks *stacks)
+{
+	if (stacks && stacks->b && stacks->b->previous)
+		stacks->b = stacks->b->previous;
+}
+
+void	rrr(t_stacks *stacks)
+{
+	rra(stacks);
+	rrb(stacks);
+}
diff --git a/stack_functions/rotate.c b/stack_functions/rotate.c
index ea412af..d330a9d 100644
--- a/stack_functions/rotate.c
+++ b/stack_functions/rotate.c
@@ -6,7 +6,7 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/12/08 14:32:10 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/12/08 14:42:04 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/12/08 14:52:37 by dgaillet         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,17 +14,13 @@
 
 void	ra(t_stacks *stacks)
 {
-	if (!stacks)
-		return ;
-	if (stacks->a->next)
+	if (stacks && stacks->a && stacks->a->next)
 		stacks->a = stacks->a->next;
 }
 
 void	rb(t_stacks *stacks)
 {
-	if (!stacks)
-		return ;
-	if (stacks->b->next)
+	if (stacks && stacks->b && stacks->b->next)
 		stacks->b = stacks->b->next;
 }
 
diff --git a/stack_functions/swap.c b/stack_functions/swap.c
new file mode 100644
index 0000000..67430fb
--- /dev/null
+++ b/stack_functions/swap.c
@@ -0,0 +1,45 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   swap.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: mteriier <mteriier@student.42lyon.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/08 14:48:44 by mteriier          #+#    #+#             */
+/*   Updated: 2025/12/08 15:04:39 by mteriier         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+
+void	sa(t_stacks *stacks)
+{
+	t_stack	a;
+	int		stock;
+
+	if (!stacks || !stacks->a || !stacks->a->next)
+		return ;
+	a = stacks->a;
+	stock = a->value;
+	a->value = a->next->value;
+	a->next->value = stock;
+}
+
+void	sb(t_stacks *stacks)
+{
+	t_stack	b;
+	int		stock;
+
+	if (!stacks || !stacks->b || !stacks->b->next)
+		return ;
+	b = stacks->b;
+	stock = b->value;
+	b->value = b->next->value;
+	b->next->value = stock;
+}
+
+void	ss(t_stacks *stacks)
+{
+	sa(stacks);
+	sb(stacks);
+}