def links
      @links = doc.css('a').map { |link| link['href'].to_s }.uniq.delete_if { |href| href.empty? }.map { |url| absolutify(url.strip) }
    end
def links
      @links = doc.css('a').map { |link| link['href'].to_s }.uniq.delete_if { |href| href.empty? }.map { |url| absolutify(url.strip) }
    end
Return the entire links found in the page; exclude empty links