diff --git a/cv9/snake.c b/cv9/snake.c
index 686878c..b6eec75 100644
--- a/cv9/snake.c
+++ b/cv9/snake.c
@@ -1,218 +1,48 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include "snake.h"
-
-/*typedef struct Snake {
-    int x;
-    int y;
-    struct Snake *next;
-} Snake;
-
-
-typedef struct State {
-    Snake *snake;
-    int food[2]; 
-    int foodCount; 
-    int height;
-    int width;
-    int speedX;
-    int speedY;
-} State;*/
-
-
-/*enum endgame {
-    END_CONTINUE,
-    END_SNAKE,
-    END_FOOD
-};*/
-
-
-void calculateNewSnakeHeadPosition(State *state, int *newX, int *newY) {
-    *newX = state->snake->x + state->speedX;
-    *newY = state->snake->y + state->speedY;
-}
-
-
-int isPointInsideSnake(Snake *snake, int x, int y) {
-    Snake *current = snake;
-    while (current != NULL) {
-        if (current->x == x && current->y == y) {
-            return 1; 
-        }
-        current = current->next;
-    }
-    return 0; 
-}
-
-
-void removeLastSnakePart(Snake *snake) {
-    Snake *current = snake;
-    Snake *previous = NULL;
-    while (current->next != NULL) {
-        previous = current;
-        current = current->next;
-    }
-    free(current);
-    if (previous != NULL) {
-        previous->next = NULL;
-    }
-}
-
-
-void addNewSnakePart(Snake *snake, int x, int y) {
-    Snake *newPart = (Snake*)malloc(sizeof(Snake));
-    if (newPart == NULL) {
-        printf("Error\n");
-        exit(1);
-    }
-    newPart->x = x;
-    newPart->y = y;
-    newPart->next = NULL;
-
-    Snake *current = snake;
-    while (current->next != NULL) {
-        current = current->next;
-    }
-    current->next = newPart;
-}
-
-
-/*int step_state(struct state* state) {
-    int newX, newY;
-    calculateNewSnakeHeadPosition(state, &newX, &newY);
-
-    if (isPointInsideSnake(state->snake, newX, newY)) {
-        return END_SNAKE; 
-    }
-
-    
-    if (newX == state->foodx[0] && newY == state->foody[1]) {
-        
-        state->foodx[0] = -1;
-        state->foody[1] = -1;
-        addNewSnakePart(state->snake, newX, newY);
-        state->foodCount--;
-
-        if (state->foodCount == 0) {
-            return END_FOOD; 
-        } else {
-            return END_CONTINUE; 
-        }
-    }
-
-   
-    if (newX >= 0 && newX < state->width && newY >= 0 && newY < state->height) {
-       
-        addNewSnakePart(state->snake, newX, newY);
-        removeLastSnakePart(state->snake);
-        return END_CONTINUE;
-    } else {
-        return END_SNAKE; 
-    }
-}*/
-int step_state(struct state* state) {
-    // Рассчитываем новые координаты головы змеи
-    int newHeadX = state->snake->x + state->sx;
-    int newHeadY = state->snake->y + state->sy;
-
-    // Проверяем, находится ли новая позиция головы змеи на змее
-    struct snake *current = state->snake->next;
-    while (current != NULL) {
-        if (current->x == newHeadX && current->y == newHeadY) {
-            return END_SNAKE; // Игра завершается из-за столкновения со змеей
-        }
-        current = current->next;
-    }
-
-    // Проверяем, находится ли новая позиция головы змеи на еде
-    for (int i = 0; i < FOOD_COUNT; ++i) {
-        if (newHeadX == state->foodx[i] && newHeadY == state->foody[i]) {
-            // Помечаем еду как съеденную и добавляем новый элемент змеи
-            state->foodx[i] = -1;
-            state->foody[i] = -1;
-            struct snake *newPart = (struct snake*)malloc(sizeof(struct snake));
-            if (newPart == NULL) {
-                printf("Ошибка выделения памяти\n");
-                exit(1);
-            }
-            newPart->x = newHeadX;
-            newPart->y = newHeadY;
-            newPart->next = state->snake;
-            state->snake = newPart;
-            return (i == FOOD_COUNT - 1) ? END_FOOD : END_CONTINUE;
-        }
-    }
-
-    // Проверяем, находится ли новая позиция головы змеи в пределах поля
-    if (newHeadX >= 0 && newHeadX < state->width && newHeadY >= 0 && newHeadY < state->height) {
-        // Добавляем новую часть змеи и удаляем последнюю
-        struct snake *newHead = (struct snake*)malloc(sizeof(struct snake));
-        if (newHead == NULL) {
-            printf("Ошибка выделения памяти\n");
-            exit(1);
-        }
-        newHead->x = newHeadX;
-        newHead->y = newHeadY;
-        newHead->next = state->snake;
-        state->snake = newHead;
-
-        // Удаляем последнюю часть змеи
-        struct snake *tail = state->snake;
-        while (tail->next->next != NULL) {
-            tail = tail->next;
-        }
-        free(tail->next);
-        tail->next = NULL;
-
-        return END_CONTINUE; // Игра продолжается после перемещения змеи
-    } else {
-        return END_SNAKE; // Игра завершается из-за выхода за пределы поля
-    }
-}
-
-/*int main() {
-    
-    State *gameState = (State*)malloc(sizeof(State));
-    if (gameState == NULL) {
-        printf("Error\n");
-        return 1;
-    }
-
-    
-    gameState->snake = (Snake*)malloc(sizeof(Snake));
-    if (gameState->snake == NULL) {
-        printf("Error\n");
-        return 1;
-    }
-    gameState->snake->x = 0;
-    gameState->snake->y = 0;
-    gameState->snake->next = NULL;
-    gameState->food[0] = 5;
-    gameState->food[1] = 5;
-    gameState->foodCount = 1;
-    gameState->height = 10;
-    gameState->width = 10;
-    gameState->speedX = 1;
-    gameState->speedY = 0;
-
-
-    int endGameReason = step_state(gameState);
-    
-    switch (endGameReason) {
-        case END_CONTINUE:
-            printf("Game continue.\n");
-            break;
-        case END_SNAKE:
-            printf("Game is finished due to colision.\n");
-            break;
-        case END_FOOD:
-            printf("Game is finished due to lack of food.\n");
-            break;
-    }
-
-    
-    free(gameState->snake);
-    free(gameState);
-
-    return 0;
-}*/
+#include <stdio.h>
+#include <stdlib.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 == NULL) {
+        fprintf(stderr, "Memory allocation failed.\n");
+        exit(EXIT_FAILURE);
+    }
+    new_head->x = x;
+    new_head->y = y;
+    new_head->next = snake;
+    return new_head;
+}
+
+struct snake* remove_snake(struct snake* snake) {
+    if (snake == NULL) {
+        return NULL;
+    }
+    struct snake* new_head = snake->next;
+    free(snake);
+    return new_head;
+}
+
+int is_snake(struct snake* snake, int x, int y) {
+    while (snake != NULL) {
+        if (snake->x == x && snake->y == y) {
+            return 1;
+        }
+        snake = snake->next;
+    }
+    return 0;
+}
+
+void free_snake(struct snake* sn) {
+    struct snake* current = sn;
+    while (current != NULL) {
+        struct snake* temp = current;
+        current = current->next;
+        free(temp);
+    }
+}
+
+int step_state(struct state* state) {
+    
+    return END_CONTINUE;
+}