diff --git a/du7/snake.c b/du7/snake.c
new file mode 100644
index 0000000..e937a56
--- /dev/null
+++ b/du7/snake.c
@@ -0,0 +1,112 @@
+#include "snake.h"
+#include <stdlib.h>
+#include <curses.h>
+
+//void freeAll(struct snake* prvok);
+
+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->next&&!snake)
+        return NULL; 
+
+    struct snake* last = snake;
+    struct snake* secondLast = snake; 
+
+    while(1){
+        if(!last->next){
+            free(last);
+            secondLast->next=NULL; 
+            return snake;
+        }
+        secondLast=last;
+        last=last->next;
+    }
+}
+
+
+void free_snake(struct snake* sn){
+    struct snake* this = sn;
+    
+    while(this){
+        struct snake* next = this->next;
+        free(this);
+        this = next;
+    }
+}
+
+/*
+void freeAll(struct snake* prvok){
+    if(!prvok) 
+        break;
+
+    else if(prvok->next)
+        freeAll(prvok->next); 
+ 
+    free(prvok); 
+}*/
+
+
+int is_snake(struct snake* snake,int x,int y){
+    
+    struct snake* this = snake;
+
+    while(this){
+        if(this->x==x && this->y==y)
+            return 1;
+
+        this = this->next;
+    }
+    return 0;
+}
+//Spojkový zoznam =============================> celá hra
+
+
+int step_state(struct state* st){
+
+	int nx = (st->snake->x + st->sx);
+    int ny = (st->snake->y + st->sy);
+    
+    if(is_snake(st->snake,nx, ny))
+        return END_SNAKE; 
+//
+    for(int i = 0;i < FOOD_COUNT; i++){
+        if(nx==st->foodx[i]&&ny==st->foody[i]){
+            st->foody[i]=-1;
+            st->foodx[i]=-1;
+            
+            add_snake(st->snake, nx, ny);
+        }
+    }
+    
+    int is_all_eaten=1;
+    for(int i = 0;i < FOOD_COUNT; i++){
+        if(st->foodx[i]>=0){
+            is_all_eaten = 0;
+            break;
+        }
+    }
+    
+    if(is_all_eaten)
+        return END_FOOD;
+// 
+    
+    if(nx<0||ny<0||nx>=COLS||ny>=LINES)
+        return END_WALL;
+//
+
+    if(st->snake->x != nx && st->snake->y != ny){
+        remove_snake(st->snake);
+        add_snake(st->snake, nx, ny);
+    }
+
+    return END_CONTINUE;
+}