diff --git a/du5/snake.c b/du5/snake.c
new file mode 100644
index 0000000..7038cdb
--- /dev/null
+++ b/du5/snake.c
@@ -0,0 +1,23 @@
+#include "snake.h"
+#include <stdlib.h>
+
+struct snake* add_snake(struct snake* snake,int x,int y){
+    return NULL;
+}
+
+struct snake* remove_snake(struct snake* snake){
+    return NULL;
+}
+
+void free_snake(struct snake* sn){
+}
+
+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 ny = (st->snake->y + st->sy);
+    return END_CONTINUE;
+}