void food(void) {
            int i;

            int food_crush_on = 0;//food가 뱀 몸통좌표에 생길 경우 on 
            int r = 0; //난수 생성에 사동되는 변수 
            gotoxy(MAP_ADJ_X, MAP_ADJ_Y + MAP_Y, " YOUR SCORE: "); //점수표시 
            printf("%3d, LAST SCORE: %3d, BEST SCORE: %3d", score, last_score, best_score);

            while (1) {
                food_crush_on = 0;
                srand((unsigned)time(NULL) + r); //난수표생성 
                food_x = (rand() % (MAP_X - 2)) + 1;    //난수를 좌표값에 넣음 
                food_y = (rand() % (MAP_Y - 2)) + 1;

                for (i = 0; i < length; i++) { //food가 뱀 몸통과 겹치는지 확인  
                    if (food_x == x[i] && food_y == y[i]) {
                        food_crush_on = 1; //겹치면 food_crush_on 를 on 
                        r++;
                        break;
                    }
                }

                if (food_crush_on == 1) continue; //겹쳤을 경우 while문을 다시 시작 

                gotoxy(MAP_ADJ_X + food_x, MAP_ADJ_Y + food_y, "ㄵ"); //안겹쳤을 경우 좌표값에 food를 찍고 
                speed -= 3; //속도 증가 
                break;

            }
        }
        void item(void) {
            int i;

            int item_crush_on = 0;//item이 뱀 몸통좌표에 생길 경우 on 
            int r1 = 1; //난수 생성에 사동되는 변수 
            gotoxy(MAP_ADJ_X, MAP_ADJ_Y + MAP_Y, " YOUR SCORE: "); //점수표시 
            printf("%3d, LAST SCORE: %3d, BEST SCORE: %3d", score, last_score, best_score);

            while (1) {
                item_crush_on = 0;
                srand((unsigned)time(NULL) + r1); //난수표생성 
                item_x = (rand() % (MAP_X - 2)) + 1;    //난수를 좌표값에 넣음 
                item_y = (rand() % (MAP_Y - 2)) + 1;

                for (i = 0; i < length; i++) { //food가 뱀 몸통과 겹치는지 확인  
                    if (item_x == x[i] && item_y == y[i]) {
                        item_crush_on = 1; //겹치면 food_crush_on 를 on 
                        r1++;
                        break;
                    }
                }

                if (item_crush_on == 1) continue; //겹쳤을 경우 while문을 다시 시작 

                gotoxy(MAP_ADJ_X + item_x, MAP_ADJ_Y + item_y, "ㄳ"); //안겹쳤을 경우 좌표값에 item를 찍고 
                speed -= 1; //속도 증가 
                break;

            }
        }
뱀게임 코드중 일부입니다.
아이템을 먹으면 꼬리가 줄어들긴하는데 먹은순간 맨뒤 꼬리가 그자리에 남아버리는데 어떻게해야할까요 ㅠㅠ 
그리고 장애물도 가장최근에 나온 장애물만 닿으면 죽고 이전것들은 이미지만 존재하네요 어떤식으로 수정해야할까요..