diff --git a/Makefile b/Makefile
index ada4fd3..4929b90 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@ FLAGS_DIR = flags
 
 CHECKER_DIR = checker
 
-INCLUDES = headers
+INCLUDES = includes
 
 #============================
 # ALL FILES WITHOUT PATH 
diff --git a/bonus/Makefile b/bonus/Makefile
new file mode 100644
index 0000000..e69de29
diff --git a/bonus/check/check_error.c b/bonus/check/check_error.c
new file mode 100644
index 0000000..e69de29
diff --git a/bonus/end_check/end_check.c b/bonus/end_check/end_check.c
new file mode 100644
index 0000000..e69de29
diff --git a/bonus/main.c b/bonus/main.c
new file mode 100644
index 0000000..e69de29
diff --git a/bonus/parsing/parsing.c b/bonus/parsing/parsing.c
new file mode 100644
index 0000000..e69de29
diff --git a/bonus/utils/push.c b/bonus/utils/push.c
new file mode 100644
index 0000000..2bca761
--- /dev/null
+++ b/bonus/utils/push.c
@@ -0,0 +1,51 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   push.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: mteriier <mteriier@student.42lyon.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/08 15:09:40 by mteriier          #+#    #+#             */
+/*   Updated: 2026/01/08 13:57:56 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+#include <stdlib.h>
+#include <unistd.h>
+
+void	pa(t_stacks *stacks)
+{
+	t_stack	*b_push;
+
+	if (!stacks || !stacks->b)
+		return ;
+	b_push = stacks->b;
+	if (stacks->b->next == stacks->b)
+		stacks->b = NULL;
+	else
+	{
+		stacks->b->next->previous = stacks->b->previous;
+		stacks->b->previous->next = stacks->b->next;
+		stacks->b = stacks->b->next;
+	}
+	stack_add_front(&(stacks->a), b_push);
+}
+
+void	pb(t_stacks *stacks)
+{
+	t_stack	*a_push;
+
+	if (!stacks || !stacks->a)
+		return ;
+	a_push = stacks->a;
+	if (stacks->a->next == stacks->a)
+		stacks->a = NULL;
+	else
+	{
+		stacks->a->next->previous = stacks->a->previous;
+		stacks->a->previous->next = stacks->a->next;
+		stacks->a = stacks->a->next;
+	}
+	stack_add_front(&(stacks->b), a_push);
+}
diff --git a/bonus/utils/rev_rotate.c b/bonus/utils/rev_rotate.c
new file mode 100644
index 0000000..7e1ccce
--- /dev/null
+++ b/bonus/utils/rev_rotate.c
@@ -0,0 +1,34 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   rev_rotate.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/08 14:43:45 by dgaillet          #+#    #+#             */
+/*   Updated: 2026/01/08 13:57:27 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+#include <unistd.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)
+{
+	if (stacks && stacks->b && stacks->b->previous)
+		stacks->b = stacks->b->previous;
+	if (stacks && stacks->a && stacks->a->previous)
+		stacks->a = stacks->a->previous;
+}
diff --git a/bonus/utils/rotate.c b/bonus/utils/rotate.c
new file mode 100644
index 0000000..fee4efa
--- /dev/null
+++ b/bonus/utils/rotate.c
@@ -0,0 +1,34 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   rotate.c                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/08 14:32:10 by dgaillet          #+#    #+#             */
+/*   Updated: 2026/01/08 13:57:47 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+#include <unistd.h>
+
+void	ra(t_stacks *stacks)
+{
+	if (stacks && stacks->a && stacks->a->next)
+		stacks->a = stacks->a->next;
+}
+
+void	rb(t_stacks *stacks)
+{
+	if (stacks && stacks->b && stacks->b->next)
+		stacks->b = stacks->b->next;
+}
+
+void	rr(t_stacks *stacks)
+{
+	if (stacks && stacks->a && stacks->a->next)
+		stacks->a = stacks->a->next;
+	if (stacks && stacks->b && stacks->b->next)
+		stacks->b = stacks->b->next;
+}
diff --git a/bonus/utils/stack_add.c b/bonus/utils/stack_add.c
new file mode 100644
index 0000000..5effe0f
--- /dev/null
+++ b/bonus/utils/stack_add.c
@@ -0,0 +1,54 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   stack_add.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/08 15:52:40 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/12/12 11:39:09 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+#include <stdlib.h>
+
+t_stack	*new_stack(int value)
+{
+	t_stack	*new;
+
+	new = malloc(sizeof(t_stack));
+	if (!new)
+		return (NULL);
+	new->value = value;
+	new->next = NULL;
+	new->previous = NULL;
+	return (new);
+}
+
+void	stack_add_back(t_stack **stack, t_stack *new)
+{
+	if (!stack || !new)
+		return ;
+	if (*stack == NULL)
+	{
+		(*stack) = new;
+		new->next = new;
+		new->previous = new;
+	}
+	else
+	{
+		(*stack)->previous->next = new;
+		new->previous = (*stack)->previous;
+		(*stack)->previous = new;
+		new->next = *stack;
+	}
+}
+
+void	stack_add_front(t_stack **stack, t_stack *new)
+{
+	if (!stack || !new)
+		return ;
+	stack_add_back(stack, new);
+	*stack = new;
+}
diff --git a/bonus/utils/stack_remove.c b/bonus/utils/stack_remove.c
new file mode 100644
index 0000000..cf19002
--- /dev/null
+++ b/bonus/utils/stack_remove.c
@@ -0,0 +1,32 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   stack_remove.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/08 16:05:27 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/12/12 11:39:02 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+#include <stdlib.h>
+
+void	stack_clear_all(t_stack *stack, t_stack *first)
+{
+	if (!stack)
+		return ;
+	if (stack->next != first)
+		stack_clear_all(stack->next, first);
+	free(stack);
+}
+
+void	free_all(t_stacks *stacks)
+{
+	if (stacks->a)
+		stack_clear_all(stacks->a, stacks->a);
+	if (stacks->b)
+		stack_clear_all(stacks->b, stacks->b);
+	free(stacks);
+}
diff --git a/bonus/utils/stacks_len.c b/bonus/utils/stacks_len.c
new file mode 100644
index 0000000..6aa44f9
--- /dev/null
+++ b/bonus/utils/stacks_len.c
@@ -0,0 +1,63 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   stacks_len.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/09 13:11:50 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/12/09 13:19:21 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+
+int	stack_a_len(t_stacks *stacks)
+{
+	t_stack	*first;
+	t_stack	*a_stack;
+	int		len;
+
+	a_stack = stacks->a;
+	first = a_stack;
+	if (!a_stack)
+		return (0);
+	len = 1;
+	while (a_stack->next != first)
+	{
+		a_stack = a_stack->next;
+		len++;
+	}
+	return (len);
+}
+
+int	stack_b_len(t_stacks *stacks)
+{
+	t_stack	*first;
+	t_stack	*b_stack;
+	int		len;
+
+	b_stack = stacks->b;
+	first = b_stack;
+	if (!b_stack)
+		return (0);
+	len = 1;
+	while (b_stack->next != first)
+	{
+		b_stack = b_stack->next;
+		len++;
+	}
+	return (len);
+}
+
+int	highest_stack_len(t_stacks *stacks)
+{
+	int	a_len;
+	int	b_len;
+
+	a_len = stack_a_len(stacks);
+	b_len = stack_b_len(stacks);
+	if (a_len > b_len)
+		return (a_len);
+	return (b_len);
+}
diff --git a/bonus/utils/swap.c b/bonus/utils/swap.c
new file mode 100644
index 0000000..2d2588b
--- /dev/null
+++ b/bonus/utils/swap.c
@@ -0,0 +1,64 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   swap.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: mteriier <mteriier@student.42lyon.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/08 14:48:44 by mteriier          #+#    #+#             */
+/*   Updated: 2026/01/08 13:58:13 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+#include <unistd.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)
+{
+	t_stack	*b;
+	t_stack	*a;
+	int		stock;
+
+	if (!stacks)
+		return ;
+	if (stacks->b && stacks->b->next)
+	{
+		b = stacks->b;
+		stock = b->value;
+		b->value = b->next->value;
+		b->next->value = stock;
+	}
+	if (stacks->a && stacks->a->next)
+	{
+		a = stacks->a;
+		stock = a->value;
+		a->value = a->next->value;
+		a->next->value = stock;
+	}
+}
diff --git a/headers/check_error.h b/includes/check_error.h
similarity index 100%
rename from headers/check_error.h
rename to includes/check_error.h
diff --git a/headers/flags.h b/includes/flags.h
similarity index 100%
rename from headers/flags.h
rename to includes/flags.h
diff --git a/headers/medium_headers.h b/includes/medium_headers.h
similarity index 100%
rename from headers/medium_headers.h
rename to includes/medium_headers.h
diff --git a/headers/parsing.h b/includes/parsing.h
similarity index 100%
rename from headers/parsing.h
rename to includes/parsing.h
diff --git a/headers/push_swap.h b/includes/push_swap.h
similarity index 100%
rename from headers/push_swap.h
rename to includes/push_swap.h