diff --git a/cv9/snake.c b/cv9/snake.c
new file mode 100644
index 0000000..7f19c5c
--- /dev/null
+++ b/cv9/snake.c
@@ -0,0 +1,66 @@
+```c
+#include "snake.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_part = (struct snake*)malloc(sizeof(struct snake));
+    if (new_part == NULL) {
+        return NULL; // Memory allocation failed
+    }
+    
+    // Set the coordinates of the new part
+    new_part->x = x;
+    new_part->y = y;
+    
+    // Set the next pointer of the new part to the current head of the snake
+    new_part->next = snake;
+    
+    // Return the new head of the snake
+    return new_part;
+}
+
+struct snake* remove_snake(struct snake* snake) {
+    // Check if the snake is empty
+    if (snake == NULL) {
+        return NULL; // Snake is empty, no part to remove
+    }
+    
+    // Save the next part of the snake
+    struct snake* next_part = snake->next;
+    
+    // Free the current head of the snake
+    free(snake);
+    
+    // Return the new head of the snake
+    return next_part;
+}
+
+int is_snake(struct snake* snake, int x, int y) {
+    // Traverse the snake
+    while (snake != NULL) {
+        // Check if the coordinates match
+        if (snake->x == x && snake->y == y) {
+            return 1; // Coordinates are part of the snake
+        }
+        // Move to the next part of the snake
+        snake = snake->next;
+    }
+    // Coordinates are not part of the snake
+    return 0;
+}
+
+void free_snake(struct snake* sn) {
+    // Traverse the snake
+    while (sn != NULL) {
+        // Save the next part of the snake
+        struct snake* next_part = sn->next;
+        
+        // Free the current part of the snake
+        free(sn);
+        
+        // Move to the next part of the snake
+        sn = next_part;
+    }
+}
+