code: @NullSafe
    public static int multiply(final int... numbers) {
      int result = 0;
  
      if (numbers != null) {
        result = (numbers.length > 0 ? 1 : 0);
        for (int number : numbers) {
          result *= number;
        }
      }
  
      return result;
    }
docs: Multiplies the array of numbers.
  
  @param numbers the array of integer values to multiply.
  @return the array of integer numbers multiplied together.