code: func ExtractSuffix(name string) (string, error) {
  	if name == "" {
  		return "", fmt.Errorf("Blank name argument passed to ExtractSuffix")
  	}
  
  	rule := publicsuffix.DefaultList.Find(name, &publicsuffix.FindOptions{IgnorePrivate: true, DefaultRule: nil})
  	if rule == nil {
  		return "", fmt.Errorf("Domain %s has no IANA TLD", name)
  	}
  
  	suffix := rule.Decompose(name)[1]
  
  	// If the TLD is empty, it means name is actually a suffix.
  	// In fact, decompose returns an array of empty strings in this case.
  	if suffix == "" {
  		suffix = name
  	}
  
  	return suffix, nil
  }
docs: // ExtractSuffix returns the public suffix of the domain using only the "ICANN"
  // section of the Public Suffix List database.
  // If the domain does not end in a suffix that belongs to an IANA-assigned
  // domain, ExtractSuffix returns an error.