def last_column
      max = 0
      @data.each do |row|
        max = row.length if max < row.length
      end
      max - 1
    end
def last_column
      max = 0
      @data.each do |row|
        max = row.length if max < row.length
      end
      max - 1
    end
Gets the last column in the table.