snake game

i'm trying to make a snake game & i can't make the lenght of the snake increase & it's score & the fruit appears one time only & i have to press on the arrow all the time please help me in this code today please.
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//start food function
void food()
{
     int difrencex = 10 - 630;
     int difrencey = 30 - 470;
     int salma = 0;
     int foodx;
     int foody;
     time_t t;
     srand((unsigned) time(&t));
     for(int i=0;i<salma;i++)
     rand();
     foodx = (rand() % difrencex);
     foody = (rand() % difrencey); 
     for(int i=0; 630>foodx>10 && 470>foody>30;i++) 
     {
     foodx = (rand() % difrencex);
     foody = (rand() % difrencey);    
     }       
     putpixel(foodx,foody,15);
     salma++; 
     static int foodcount = 0;
     score = 0;
     int nextx;
     int nexty;
     nextx = snake.head_x;
     nexty = snake.head_y;
     if(snake.head_dir == RIGHT)
     {
                       nextx++;
     }
     if(snake.head_dir == LEFT)
     {
                       nextx--;
     }
     if(snake.head_dir == UP)
     {
                       nexty--;
     }
     if(snake.head_dir == DOWN)
     {
                       nexty++;
     }
     int nextpixel;
     nextpixel = getpixel(nextx,nexty);
     if(nextpixel==15) 
     {
                  
     if (snake.tail_dir == UP)
           {
             for ( int i = 0; i<101;i++) 
             putpixel (snake.tail_x,snake.tail_y+i,15); 
             snake.tail_y +=100;
           }
        if (snake.tail_dir == DOWN)
          {
            for (int i = 0; i<101;i++) 
            putpixel (snake.tail_x,snake.tail_y-i,15); 
            snake.tail_y -=100;
          } 
        if (snake.tail_dir == LEFT)
          {
            for (int i = 0; i<101;i++)
            putpixel (snake.tail_x+i,snake.tail_y,15); 
            snake.tail_x +=100;
            //printf ("LEFT");
          }
        if (snake.tail_dir == RIGHT)
          {
             for ( int i = 0; i<101;i++)
             putpixel (snake.tail_x-i,snake.tail_y,15); 
             snake.tail_x -=100;
             //printf ("RIGHT");
          } 
   

                  foodcount--;
                  score+=10;
                  settextstyle(3,0,2);
                  sprintf(scorestring,"score : %d ",score);
                  outtextxy(1,0,scorestring);
     }
}

//start function bouns
/*void bouns()
{
     int difrencex = 620 - 20;
     int difrencey = 460 - 40;
     int salma = 0;
     int bounsx;
     int bounsy;
     time_t t;
     srand((unsigned) time(&t));
     for(int i=0;i<salma;i++)
     rand();
     bounsx = (rand() % difrencex);
     bounsy = (rand() % difrencey);
     int j = 20;
     setcolor(LIGHTBLUE);
     circle(bounsx+j,bounsy+j,1);
     salma++;
}*/

//Game Over
void GameOver()
{
     if(snake.head_x <= 10 || snake.head_x >= 630 || snake.head_y <= 30 || snake.head_y >= 470)
     {
                     settextstyle(3,0,2);
                     outtextxy(290,220,"Game Over");
                     delay(3000);
                     exit(1);
     }
     int nextx;
     int nexty;
     nextx = snake.head_x;
     nexty = snake.head_y;
     if(snake.head_dir == RIGHT)
     {
                       nextx++;
     }
     if(snake.head_dir == LEFT)
     {
                       nextx--;
     }
     if(snake.head_dir == UP)
     {
                       nexty--;
     }
     if(snake.head_dir == DOWN)
     {
                       nexty++;
     }
     int nextpixel;
     nextpixel = getpixel(nextx,nexty);
     if(nextpixel == LIGHTGREEN)
     {
                 settextstyle(3,0,2);
                 outtextxy(290,220,"Game Over");
                 delay(3000);
                 exit(1);
     }
}

//start function Game
void Game()
{
     food();
     //bouns();
     while(1)
     {
             move();
             GameOver();
     }
}
I would suggest making a variable for the length of the snake. then U can just add to it.
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