diff --git a/cv9/snake.c b/cv9/snake.c
new file mode 100644
index 0000000..68e2e35
--- /dev/null
+++ b/cv9/snake.c
@@ -0,0 +1,60 @@
+#include "snake.h"
+#include <stdlib.h>
+
+struct snake* add_snake(struct snake* snake,int x,int y){
+    struct snake* head = calloc(1,sizeof(struct snake));
+    head->x = x;
+    head->y = y;
+    head->next = snake;
+    
+    return head;
+}
+
+struct snake* remove_snake(struct snake* snake){
+    if(snake==NULL){
+        return NULL;
+    }
+    struct snake* curent_element = snake;
+    while(curent_element->next != NULL){
+        curent_element = curent_element->next;
+    }
+    
+    free(curent_element);
+    
+    if(curent_element==snake){
+        return NULL;
+    }
+    
+    return snake;
+}
+
+void free_snake(struct snake* sn){
+    struct snake* current=sn;
+    if(current==NULL){
+        return;
+    }
+    struct snake* next_element;
+    while(current->next!=NULL){
+        next_element=current->next;
+        free(current);
+        current=next_element;
+    }
+    free(current);
+}
+
+int is_snake(struct snake* snake,int x,int y){
+    struct snake* current =snake;
+    while(current!=NULL){
+        if(x==current->x&&y==current->y){
+            return 1;
+        }
+        current=current->next;
+    }
+    return 0;
+}
+
+int step_state(struct state* st){
+	int nx = (st->snake->x + st->sx);
+    int ny = (st->snake->y + st->sy);
+    return END_CONTINUE;
+}