diff --git a/du7/snake.c b/du7/snake.c
index 7caa28a..764b4c3 100644
--- a/du7/snake.c
+++ b/du7/snake.c
@@ -1,6 +1,6 @@
 #include "snake.h"
 #include <stdlib.h>
-
+#include <stdio.h>
 struct snake* add_snake(struct snake* snake, int x, int y) {
     struct snake* head = calloc(1, sizeof(struct snake));
     head->x = x;
@@ -44,8 +44,32 @@ int is_snake(struct snake* snake, int x, int y) {
     }
     return 0;
 }
-int step_state(struct state* st){
-	int nx = (st->snake->x + st->sx);
+int step_state(struct state* st) {
+    int nx = (st->snake->x + st->sx);
     int ny = (st->snake->y + st->sy);
+    int count = 0;
+    if (nx < 0 || nx >= st->width || ny < 0 || ny >= st->height) {
+        return END_WALL;
+    }
+    if (is_snake(st->snake->next, nx, ny)) {
+        return END_SNAKE;
+    }
+    for (int i = 0; i < FOOD_COUNT; i++) {
+        if (nx == st->foodx[i] && ny == st->foody[i]) {
+            count++;
+            st->snake = add_snake(st->snake, nx, ny);
+            st->foodx[i] = -1;
+            st->foody[i] = -1;
+            if (count == FOOD_COUNT) {
+                return END_FOOD;
+            }
+        }
+    }
+    st->snake = add_snake(st->snake, nx, ny);
+    st->snake = remove_snake(st->snake);
     return END_CONTINUE;
 }
+
+
+
+