def tall_to_middle
      if (@total_bins > 1) && ((@total_bins % 2) != 0)
        _, max_col = @sizes.each_with_index.max
        mid_col = @total_bins / 2

        temp = @bins[mid_col].clone
        @bins[mid_col] = @bins[max_col]
        @bins[max_col] = temp
      end
    end
def tall_to_middle
      if (@total_bins > 1) && ((@total_bins % 2) != 0)
        _, max_col = @sizes.each_with_index.max
        mid_col = @total_bins / 2

        temp = @bins[mid_col].clone
        @bins[mid_col] = @bins[max_col]
        @bins[max_col] = temp
      end
    end
moves the tallest bin to the middle