/**
   * Checks to see if a param of the arry list is full
   *
   * @return true or false
   */
  public boolean isFull() {

    for (Level indiv_level : levels) {
      if (!indiv_level.isFull()) {
        return false;
      }
    }
    return true;
  }
 /**
  * Adds car to array list if num of spots isnt full
  *
  * @param incomingCar
  * @return the level the car was added to
  */
 public int addCar(Car incomingCar) {
   int counter = 1;
   for (Level indiv_level : levels) {
     if (!indiv_level.isFull()) {
       indiv_level.addCar(incomingCar);
       break;
     }
     counter++;
   }
   return counter;
 }