def rates(table_rows)
      table_rows.map do |e|
        e.css('.content').map(&:text).map(&:strip).map do |txt|
          txt.split("\n").map(&:strip)
        end
      end
    end
def rates(table_rows)
      table_rows.map do |e|
        e.css('.content').map(&:text).map(&:strip).map do |txt|
          txt.split("\n").map(&:strip)
        end
      end
    end
Extract the text descriping the exchange rates from content <p> nodes
 @return [Array<Array>] text description for buy/sell rates