void change_nick()
{
  while(quit== false)
  {
    if( SDL_PollEvent( &event ) )
    {     //Checks if user wants to quit
      switch (event.type)
      {
        case SDL_QUIT: 
        {
          quit = true;
          break;
        }
        case SDL_KEYDOWN:
        {
          switch( event.key.keysym.sym)
          {
            case SDLK_BREAK: return;
          }
          player_nick = player_nick + event.key.keysym.sym;
        }
      )
    }
  }
}