code: def get_domain_url(url):
      
      if "http://" not in url and "https://" not in url:
          return url
      url_header = url.split('://')[0]
      simple_url = url.split('://')[1]
      base_url = simple_url.split('/')[0]
      domain_url = url_header + '://' + base_url
      return domain_url
docs: Use this to convert a url like this:
      https://blog.xkcd.com/2014/07/22/what-if-book-tour/
      Into this:
      https://blog.xkcd.com