diff --git a/du7/snake.c b/du7/snake.c
new file mode 100644
index 0000000..25fcdb5
--- /dev/null
+++ b/du7/snake.c
@@ -0,0 +1,133 @@
+#include "snake.h"
+#include <stdlib.h>
+struct snake* add_snake(struct snake* snake,int x,int y){
+    struct snake* first_element = calloc(1,sizeof(struct snake));
+    first_element->x = x;
+    first_element->y = y;
+
+    first_element->next = snake;
+    return first_element;
+}
+int is_snake(struct snake* snake,int x,int y){
+    if(snake == NULL)
+        return 0;
+    struct snake* step_snake = snake;
+
+    while (step_snake->next != NULL)
+    {
+        if (step_snake->x == x && step_snake->y == y)
+        {
+            return 1;
+        }
+        step_snake = step_snake->next;
+    }
+    
+     if (step_snake->x == x && step_snake->y == y)
+        {
+            return 1;
+        }
+    return 0;
+}
+
+int step_state(struct state* st){
+    struct snake* main_element = st->snake;
+    //hlavu 
+    int root_x = st->snake->x;
+    int nx = (st->snake->x + st->sx);
+    int root_y = st->snake->y;
+    int ny = (st->snake->y + st->sy);
+    // pohybovať hlavou
+    st->snake->y = ny;
+    st->snake->x = nx;
+
+    st->snake = st->snake->next;
+    while (st->snake->next != NULL)
+    {
+        //zmeniť na hodnotu ďalšieho prvku
+        int step_prev_x = st->snake->x;
+        int step_prev_y = st->snake->y;
+
+        st->snake->x = root_x;
+        st->snake->y = root_y;
+
+        root_x = step_prev_x;
+        root_y = step_prev_y;
+
+        st->snake = st->snake->next;
+    }
+    //zmeniť hodnotu posledného prvku
+    st->snake->x = root_x;
+    st->snake->y = root_y;
+
+    st->snake = main_element;
+
+    root_x = main_element->x;
+    root_y = main_element->y;
+    if (main_element->next != NULL){
+       st->snake = main_element->next;
+    }
+    while (st->snake->next != NULL)
+    {
+        if (st->snake->x == root_x && st->snake->y == root_y)
+        {
+            free_snake(st->snake);
+            free(main_element);//voľne alokované mamory (Pamätaj)
+            return END_SNAKE;
+        }
+        st->snake = st->snake->next;
+    }
+        if (st->snake->x == root_x && st->snake->y == root_y)
+        {
+            free_snake(st->snake);
+            free(main_element);
+
+            return END_SNAKE;
+        }
+    st->snake = main_element;
+int i = 0;
+while (i < FOOD_COUNT)
+{
+    if (st->foodx[i] == st->snake->x && st->foody[i] == st->snake->y)
+    {
+        st->snake = add_snake(st->snake, st->foodx[i], st->foody[i]);
+        //koordinovať -1
+        st->foody[i] = -1;
+        st->foodx[i] = -1;
+        main_element = st->snake;
+    }
+    i++;
+}
+int k =0;
+while(k < FOOD_COUNT)
+{
+    if (st->foodx[k] != -1 && st->foody[k] != -1)
+        return END_CONTINUE;
+    k++;
+}
+
+    free(main_element);
+    return END_FOOD;
+}
+
+
+void free_snake(struct snake* sn){
+    if(sn != NULL){
+        free(sn);
+    }
+}
+struct snake* remove_snake(struct snake* snake){
+    if(snake == NULL|| snake->next == NULL)
+        return NULL;
+
+    struct snake* main_element = snake;
+    struct snake* step_snake = snake;
+    //cheak
+    while (step_snake->next->next != NULL)
+    {
+        step_snake = step_snake->next;
+    }
+    step_snake->next = NULL;
+    step_snake = main_element;
+return step_snake;
+}
+