diff --git a/cv9/snake.c b/cv9/snake.c
index 32dfd50..9519b3b 100644
--- a/cv9/snake.c
+++ b/cv9/snake.c
@@ -1,3 +1,21 @@
+#include "snake.h"
+#include <stddef.h>
+#include <stdlib.h>
+
+struct snake* add_snake(struct snake* snake,int x,int y) {
+    // Allocate memory for the new snake part
+    struct snake* new_snake_part = calloc(1, sizeof(struct snake));
+    if (new_snake_part == NULL) {
+        return NULL; // Memory allocation failed
+    }
+    // Set coordinates of the new snake part
+    new_snake_part->x = x;
+    new_snake_part->y = y;
+    // The new snake part becomes the head of the snake
+    new_snake_part->next = snake;
+    return new_snake_part;
+}
+
 struct snake* remove_snake(struct snake* snake) {
     if (snake == NULL) {
         return NULL;
@@ -19,3 +37,30 @@ struct snake* remove_snake(struct snake* snake) {
     return snake;
 }
 
+int is_snake(struct snake* snake,int x, int y) {
+    // Traverse the snake linked list
+    struct snake* current = snake;
+    while (current != NULL) {
+        // Check if current snake part has the given coordinates
+        if (current->x == x && current->y == y) {
+            return 1; // Coordinates found in the snake
+        }
+        current = current->next;
+    }
+    return 0; // Coordinates not found in the snake
+}
+
+void free_snake(struct snake* sn) {
+    struct snake* current = sn;
+    while (current != NULL) {
+        struct snake* next = current->next;
+        free(current);
+        current = next;
+    }
+}
+
+int step_state(struct state* state) {
+    // Implementation of this function is left to you
+    return END_CONTINUE;
+}
+