code: func DomainSuffix(url string) string {
  	domain := Domain(url)
  	if len(domain) != 0 {
  		return domain[strings.Index(domain, ".")+1:]
  	}
  	return ""
  }
docs: // DomainSuffix returns domain suffix from provided url.
  // If no TLD is found in provided url, this function returns empty string.