diff --git a/.gitignore b/.gitignore
index 8bb8cf9..02a4d89 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ Session.vim
 test.txt
 checker_linux
 .vscode/
+checker
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 5bf9c92..2259aa4 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,7 @@ VPATH = src:src/util:src/moves:src/sort
 
 SOURCES = push_all_but_3_b.c push_all_but_lis.c push.c put_at_index_asc.c \
 			reverse_rotate.c rotate_a.c rotate_a_to.c rotate_a_to_top.c \
-			rotate_b.c rotate.c shortest_rotate.c swap.c push_swap.c \
+			rotate_b.c rotate.c shortest_rotate.c swap.c \
 			best_merge_a.c b_merge_a.c common_rotations.c count_moves_merge_a.c \
 			sort3.c sortmore.c count_gt.c error.c free_state.c ft_abs.c \
 			ft_lstat.c ft_max.c has_duplicates.c index_of.c initialise_state.c \
@@ -30,7 +30,12 @@ SOURCES = push_all_but_3_b.c push_all_but_lis.c push.c put_at_index_asc.c \
 			longest_incremental_subsequence.c new_element.c print_stack.c \
 			print_state.c stack_min.c
 
+SOURCES_PUSH_SWAP = push_swap.c
+SOURCES_CHECKER = checker.c
+
 OBJECTS = $(addprefix $(OBJ_PATH)/, $(SOURCES:.c=.o))
+OBJECTS_PUSH_SWAP = $(addprefix $(OBJ_PATH)/, $(SOURCES_PUSH_SWAP:.c=.o))
+OBJECTS_CHECKER = $(addprefix $(OBJ_PATH)/, $(SOURCES_CHECKER:.c=.o))
 
 CC = cc
 RM = rm -rf
@@ -40,15 +45,19 @@ CFLAGS = -Wall -Wextra -Werror -g
 LDFLAGS = -L./libft
 LDLIBS = -lft
 
-all: $(NAME)
+all: $(NAME) checker
 
 $(LIBFT):
 	@echo "Make Libft and add the archive to lib and the header to inc"
 	@$(MAKE) -sC libft
 
-$(NAME): $(OBJECTS)
+$(NAME): $(OBJECTS) $(OBJECTS_PUSH_SWAP)
 	@echo "Linking the object files in the executable."
-	@$(CC) $(CFLAGS) $(OBJECTS) $(LDFLAGS) $(LDLIBS) -o $(NAME)
+	@$(CC) $(CFLAGS) $(OBJECTS) $(OBJECTS_PUSH_SWAP) $(LDFLAGS) $(LDLIBS) -o $(NAME)
+
+checker: $(OBJECTS) $(OBJECTS_CHECKER)
+	@echo "Linking the object files in the executable."
+	@$(CC) $(CFLAGS) $(OBJECTS) $(OBJECTS_CHECKER) $(LDFLAGS) $(LDLIBS) -o checker
 
 $(OBJ_PATH):
 	@mkdir -p $@
diff --git a/inc/push_swap.h b/inc/push_swap.h
index 81ebdbd..b841f6b 100644
--- a/inc/push_swap.h
+++ b/inc/push_swap.h
@@ -66,15 +66,15 @@ void	reverse_rotate(t_list **stack);
 
 void	swap(t_list **stack);
 
-void	pa(t_state *state);
-void	pb(t_state *state);
-void	sa(t_state *state);
-void	sb(t_state *state);
-void	ss(t_state *state);
-void	ra(t_state *state);
-void	rb(t_state *state);
-void	rr(t_state *state);
-void	rra(t_state *state);
-void	rrb(t_state *state);
-void	rrr(t_state *state);
+void	pa(t_state *state, int silent);
+void	pb(t_state *state, int silent);
+void	sa(t_state *state, int silent);
+void	sb(t_state *state, int silent);
+void	ss(t_state *state, int silent);
+void	ra(t_state *state, int silent);
+void	rb(t_state *state, int silent);
+void	rr(t_state *state, int silent);
+void	rra(t_state *state, int silent);
+void	rrb(t_state *state, int silent);
+void	rrr(t_state *state, int silent);
 #endif
diff --git a/libft/Makefile b/libft/Makefile
index 6cf0c5b..1fddf37 100644
--- a/libft/Makefile
+++ b/libft/Makefile
@@ -23,7 +23,7 @@ WARNINGS = -Wall -Wextra -Werror
 CFLAGS = $(WARNINGS)
 
 VPATH	= 	src:src/conversion:src/ft_printf:src/list:src/memory:src/output:\
-			src/string
+			src/string:src/get_next_line
 
 SRC_CONVERSION  = 	ft_atoi.c ft_itoa.c ft_tolower.c ft_toupper.c \
 
@@ -33,7 +33,7 @@ SRC_MEMORY = 	ft_memchr.c ft_memcmp.c ft_memcpy.c ft_memmove.c ft_memset.c \
 SRC_STRING =	ft_isalnum.c ft_isalpha.c ft_isascii.c ft_isdigit.c ft_isprint.c \
 				ft_split.c ft_strchr.c ft_strdup.c ft_striteri.c ft_strjoin.c \
 				ft_strlcat.c ft_strlcpy.c ft_strlen.c ft_strmapi.c ft_strncmp.c \
-				ft_strnstr.c ft_strrchr.c ft_strtrim.c ft_substr.c
+				ft_strnstr.c ft_strrchr.c ft_strtrim.c ft_substr.c ft_strcmp.c
 
 SRC_LIST = 		ft_lstadd_back.c ft_lstadd_front.c ft_lstclear.c ft_lstdelone.c \
 				ft_lstiter.c ft_lstlast.c ft_lstmap.c ft_lstnew.c ft_lstsize.c
@@ -45,8 +45,10 @@ SRC_FT_PRINTF = ft_isbase.c ft_putnbr_base.c ft_write_str.c parse_placeholder.c
 				ft_putnbr_signed.c parse_conversion.c print_char.c \
 				print_number.c print_string.c
 
+SRC_GET_NEXT_LINE = get_next_line.c
+
 SOURCES = 	$(SRC_CONVERSION) $(SRC_MEMORY) $(SRC_STRING) \
-			$(SRC_LIST) $(SRC_OUTPUT) $(SRC_FT_PRINTF)
+			$(SRC_LIST) $(SRC_OUTPUT) $(SRC_FT_PRINTF) $(SRC_GET_NEXT_LINE)
 
 OBJECTS = $(addprefix $(OBJ_DIR)/, $(SOURCES:.c=.o))
 
diff --git a/libft/inc/libft.h b/libft/inc/libft.h
index 70a72be..a8aa2b5 100644
--- a/libft/inc/libft.h
+++ b/libft/inc/libft.h
@@ -37,6 +37,7 @@ 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_strcmp(const char *s1, const char *s2);
 void	*ft_memchr(const void *s, int c, size_t n);
 int		ft_memcmp(const void *s1, const void *s2, size_t n);
 char	*ft_strnstr(const char *big, const char *little, size_t len);
@@ -74,4 +75,12 @@ t_list	*ft_lstmap(t_list *lst, void *(*f)(void *), void (*del)(void *));
 */
 
 int		ft_printf(const char *format, ...);
+
+/*
+ *	get_next_line
+*/
+# define OPEN_MAX 1024
+# define BUFFER_SIZE 256
+char    *get_next_line(int fd);
+
 #endif
diff --git a/src/checker.c b/src/checker.c
index b54d826..f940842 100644
--- a/src/checker.c
+++ b/src/checker.c
@@ -11,12 +11,36 @@
 /* ************************************************************************** */
 
 #include "push_swap.h"
+#include <unistd.h>
+#include <stdlib.h>
+
+void execute_move(const char *move, t_state *state)
+{
+	void	(*const moves[])(t_state *, int) = {&sa, &sb, &ss, &pa, &pb, \
+								&ra, &rb, &rr, &rra, &rrb, &rrr};
+	const char	*moves_names[] = {"sa\n", "sb\n", "ss\n", "pa\n", "pb\n", \
+								"ra\n", "rb\n", "rr\n", "rra\n", "rrb\n", "rrr\n"};
+	int 		i;
+
+	i = 0;
+	while (i < 11)
+	{
+		if (ft_strcmp(move, moves_names[i]) == 0)
+		{
+			moves[i](state, 1);
+			return;
+		}
+		i++;
+	}
+	ft_putstr_fd("Error: Invalid move\n", 2);
+}
 
 int	main(int argc, char *argv[])
 {
+	int	size;
 	t_state	*state;
+	char	*move;
 
-	state = NULL;
 	if (!initialise_state(&state))
 		return (1);
 	while (argc-- > 1)
@@ -26,9 +50,16 @@ int	main(int argc, char *argv[])
 		if (has_duplicates(state->a))
 			return (error(state));
 	}
-	if (ft_lstsize(state->a) <= 1 || is_sorted(state->a))
-		return (0);
-	sortmore(state);
-	free_state(state);
-	return (0);
+	size = ft_lstsize(state->a);
+	move = get_next_line(STDIN_FILENO);
+	while (move)
+	{
+		execute_move(move, state);
+		free(move);
+		move = get_next_line(STDIN_FILENO);
+	}
+	free(move);
+	if (ft_lstsize(state->a) == size && (size == 0 || is_sorted(state->a)))
+		return (free_state(state), ft_printf("OK\n"));
+	return (free_state(state), ft_printf("KO\n"));
 }
diff --git a/src/moves/push.c b/src/moves/push.c
index 7005a24..d13947e 100644
--- a/src/moves/push.c
+++ b/src/moves/push.c
@@ -12,28 +12,27 @@
 
 #include "libft.h"
 #include "push_swap.h"
+#include <unistd.h>
 
-void	pb(t_state *state)
+void	pb(t_state *state, int silent)
 {
 	push(&(state->a), &(state->b));
-	#ifndef SILENT
-	ft_printf("pb\n");
-	#endif
+	if (!silent)
+		ft_putstr_fd("pb\n", STDOUT_FILENO);
 }
 
-void	pa(t_state *state)
+void	pa(t_state *state, int silent)
 {
 	push(&(state->b), &(state->a));
-	#ifndef SILENT
-	ft_printf("pa\n");
-	#endif
+	if (!silent)
+		ft_putstr_fd("pa\n", STDOUT_FILENO);
 }
 
 void	push(t_list **stack_1, t_list **stack_2)
 {
 	t_list	*temp;
 
-	if (!stack_1)
+	if (!*stack_1)
 		return ;
 	temp = (*stack_1)->next;
 	ft_lstadd_front(stack_2, *stack_1);
diff --git a/src/moves/push_all_but_3_b.c b/src/moves/push_all_but_3_b.c
index 0f9d6db..433b894 100644
--- a/src/moves/push_all_but_3_b.c
+++ b/src/moves/push_all_but_3_b.c
@@ -20,5 +20,5 @@ void	push_all_but_3_b(t_state *state)
 
 	i = 0;
 	while (i++ < size - 3)
-		pb(state);
+		pb(state, 0);
 }
diff --git a/src/moves/push_all_but_lis.c b/src/moves/push_all_but_lis.c
index 4ad3d7d..6500cdc 100644
--- a/src/moves/push_all_but_lis.c
+++ b/src/moves/push_all_but_lis.c
@@ -29,10 +29,10 @@ void	push_all_but_lis(t_state *state)
 		if (j < lis_size && i == lis_indices[j])
 		{
 			j++;
-			ra(state);
+			ra(state, 0);
 		}
 		else
-			pb(state);
+			pb(state, 0);
 		i++;
 	}
 	free(lis_indices);
diff --git a/src/moves/reverse_rotate.c b/src/moves/reverse_rotate.c
index d33a4cc..88069b0 100644
--- a/src/moves/reverse_rotate.c
+++ b/src/moves/reverse_rotate.c
@@ -12,30 +12,28 @@
 
 #include "libft.h"
 #include "push_swap.h"
+#include <unistd.h>
 
-void	rra(t_state *state)
+void	rra(t_state *state, int silent)
 {
 	reverse_rotate(&(state->a));
-	#ifndef SILENT
-	ft_printf("rra\n");
-	#endif
+	if (!silent)
+		ft_putstr_fd("rra\n", STDOUT_FILENO);
 }
 
-void	rrb(t_state *state)
+void	rrb(t_state *state, int silent)
 {
 	reverse_rotate(&(state->b));
-	#ifndef SILENT
-	ft_printf("rrb\n");
-	#endif
+	if (!silent)
+		ft_putstr_fd("rrb\n", STDOUT_FILENO);
 }
 
-void	rrr(t_state *state)
+void	rrr(t_state *state, int silent)
 {
 	reverse_rotate(&(state->a));
 	reverse_rotate(&(state->b));
-	#ifndef SILENT
-	ft_printf("rrr\n");
-	#endif
+	if (!silent)
+		ft_putstr_fd("rrr\n", STDOUT_FILENO);
 }
 
 void	reverse_rotate(t_list **stack)
@@ -43,7 +41,7 @@ void	reverse_rotate(t_list **stack)
 	t_list	*temp;
 	t_list	*last;
 
-	if (!stack)
+	if (!*stack)
 		return ;
 	temp = *stack;
 	last = ft_lstlast(*stack);
diff --git a/src/moves/rotate.c b/src/moves/rotate.c
index e979f65..cd7192e 100644
--- a/src/moves/rotate.c
+++ b/src/moves/rotate.c
@@ -12,37 +12,35 @@
 
 #include "libft.h"
 #include "push_swap.h"
+#include <unistd.h>
 
-void	ra(t_state *state)
+void	ra(t_state *state, int silent)
 {
 	rotate(&(state->a));
-	#ifndef SILENT
-	ft_printf("ra\n");
-	#endif
+	if (!silent)
+		ft_putstr_fd("ra\n", STDOUT_FILENO);
 }
 
-void	rb(t_state *state)
+void	rb(t_state *state, int silent)
 {
 	rotate(&(state->b));
-	#ifndef SILENT
-	ft_printf("rb\n");
-	#endif
+	if (!silent)
+		ft_putstr_fd("rb\n", STDOUT_FILENO);
 }
 
-void	rr(t_state *state)
+void	rr(t_state *state, int silent)
 {
 	rotate(&(state->a));
 	rotate(&(state->b));
-	#ifndef SILENT
-	ft_printf("rr\n");
-	#endif
+	if (!silent)
+		ft_putstr_fd("rr\n", STDOUT_FILENO);
 }
 
 void	rotate(t_list **stack)
 {
 	t_list	*temp;
 
-	if (!stack)
+	if (!*stack)
 		return ;
 	temp = (*stack)->next;
 	(*stack)->next = NULL;
diff --git a/src/moves/rotate_a.c b/src/moves/rotate_a.c
index 7260823..a8fd81b 100644
--- a/src/moves/rotate_a.c
+++ b/src/moves/rotate_a.c
@@ -16,12 +16,12 @@ void	rotate_a(int n, t_state *state)
 {
 	while (n > 0)
 	{
-		ra(state);
+		ra(state, 0);
 		n--;
 	}
 	while (n < 0)
 	{
-		rra(state);
+		rra(state, 0);
 		n++;
 	}
 }
diff --git a/src/moves/rotate_b.c b/src/moves/rotate_b.c
index 062aa36..3398bf5 100644
--- a/src/moves/rotate_b.c
+++ b/src/moves/rotate_b.c
@@ -16,12 +16,12 @@ void	rotate_b(int n, t_state *state)
 {
 	while (n > 0)
 	{
-		rb(state);
+		rb(state, 0);
 		n--;
 	}
 	while (n < 0)
 	{
-		rrb(state);
+		rrb(state, 0);
 		n++;
 	}
 }
diff --git a/src/moves/swap.c b/src/moves/swap.c
index 280389b..85009a5 100644
--- a/src/moves/swap.c
+++ b/src/moves/swap.c
@@ -12,30 +12,27 @@
 
 #include "libft.h"
 #include "push_swap.h"
+#include <unistd.h>
 
-void	sa(t_state *state)
+void	sa(t_state *state, int silent)
 {
 	swap(&(state->a));
-	#ifndef SILENT
-	ft_printf("sa\n");
-	#endif
+	if (!silent)
+		ft_putstr_fd("sa\n", STDOUT_FILENO);
 }
-
-void	sb(t_state *state)
+void	sb(t_state *state, int silent)
 {
 	swap(&(state->b));
-	#ifndef SILENT
-	ft_printf("sb\n");
-	#endif
+	if (!silent)
+		ft_putstr_fd("sb\n", STDOUT_FILENO);
 }
 
-void	ss(t_state *state)
+void	ss(t_state *state, int silent)
 {
 	swap(&(state->a));
 	swap(&(state->b));
-	#ifndef SILENT
-	ft_printf("ss\n");
-	#endif
+	if (!silent)
+		ft_putstr_fd("ss\n", STDOUT_FILENO);
 }
 
 void	swap(t_list **stack)
diff --git a/src/sort/b_merge_a.c b/src/sort/b_merge_a.c
index 0c6266a..2e2fdda 100644
--- a/src/sort/b_merge_a.c
+++ b/src/sort/b_merge_a.c
@@ -24,5 +24,5 @@ void	b_merge_a(int idx_b, t_state *state)
 	common_rotations(&shortest_a, &shortest_b, state);
 	rotate_a(shortest_a, state);
 	rotate_b(shortest_b, state);
-	pa(state);
+	pa(state, 0);
 }
diff --git a/src/sort/common_rotations.c b/src/sort/common_rotations.c
index dd4298d..b620b42 100644
--- a/src/sort/common_rotations.c
+++ b/src/sort/common_rotations.c
@@ -20,7 +20,7 @@ void	common_rotations(int *shortest_a, int *shortest_b, t_state *state)
 		{
 			while (*shortest_a > 0 && *shortest_b > 0)
 			{
-				rr(state);
+				rr(state, 0);
 				(*shortest_a)--;
 				(*shortest_b)--;
 			}
@@ -29,7 +29,7 @@ void	common_rotations(int *shortest_a, int *shortest_b, t_state *state)
 		{
 			while (*shortest_a < 0 && *shortest_b < 0)
 			{
-				rrr(state);
+				rrr(state, 0);
 				(*shortest_a)++;
 				(*shortest_b)++;
 			}
diff --git a/src/sort/sort3.c b/src/sort/sort3.c
index 71752df..5f58874 100644
--- a/src/sort/sort3.c
+++ b/src/sort/sort3.c
@@ -32,10 +32,10 @@ int	sort3(t_state *state)
 		return (1);
 	else if (a < b && b > c && a < c)
 	{
-		rra(state);
-		sa(state);
+		rra(state, 0);
+		sa(state, 0);
 	}
 	else if ((a > b && a < c) || (a > b && b > c))
-		sa(state);
+		sa(state, 0);
 	return (1);
 }
diff --git a/tester.sh b/tester.sh
index ea63876..a548d62 100755
--- a/tester.sh
+++ b/tester.sh
@@ -14,7 +14,7 @@ run_test_case() {
 	do
 		ARG=$(seq -1000 1000 | shuf -n $N)
 		OPS=$(./push_swap $ARG | wc -l)
-		OK=$(./push_swap $ARG | ./checker_linux $ARG)
+		OK=$(./push_swap $ARG | ./checker $ARG)
 		if [ $OPS -gt $MAX ]
 		then
 			MAX_ARGS="Max: $OPS | $(echo $ARG | tr -d '\n')"
@@ -49,6 +49,17 @@ run_test_case() {
 
 }
 
-run_test_case 500 1000
+run_test_case 1 10
+run_test_case 2 10
+run_test_case 3 10
+run_test_case 4 10
+run_test_case 5 10
+run_test_case 10 10
+run_test_case 20 10
+run_test_case 50 10
+run_test_case 100 10
+run_test_case 200 10
+run_test_case 500 10
+