diff --git a/du5/program.c b/du5/program.c
index e69de29..f7efbe0 100644
--- a/du5/program.c
+++ b/du5/program.c
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include "snake.h"
+
+
+struct snake *add_snake(struct snake *snake, int x, int y) {
+    struct snake *new_head = (struct snake *)malloc(sizeof(struct snake));
+    if (!new_head) {
+        return NULL; 
+    }
+    new_head->x = x;
+    new_head->y = y;
+    new_head->next = snake; 
+    return new_head;
+}
+
+struct snake *remove_snake(struct snake *snake) {
+    if (!snake) {
+        return NULL; 
+    }
+
+    if (!snake->next) {
+        free(snake); 
+        return NULL;
+    }
+
+    struct snake *current = snake;
+    while (current->next && current->next->next) {
+        current = current->next;
+    }
+
+    free(current->next); 
+    current->next = NULL; 
+    return snake;
+}
+
+int is_snake(struct snake *snake, int x, int y) {
+    struct snake *current = snake;
+    while (current) {
+        if (current->x == x && current->y == y) {
+            return 1; 
+        }
+        current = current->next;
+    }
+    return 0; 
+}
+