docs: def concat_urls(*urls):
      """Concat Urls
      Args:
          *args: (str)
  
      Returns:
          str: urls starting and ending with / merged with /
      """
      normalized_urls = filter(bool, [url.strip('/') for url in urls])
      joined_urls = '/'.join(normalized_urls)
      if not joined_urls:
          return '/'
      return '/{}/'.format(joined_urls)