code: func FormatBuildAddress(id int64, bucket, builder string, number int) string {
  	if number > 0 {
  		return fmt.Sprintf("%s/%s/%d", bucket, builder, number)
  	}
  
  	return strconv.FormatInt(id, 10)
  }
docs: // FormatBuildAddress returns a value for TagBuildAddress tag.
  // If number is positive, returns "<bucket>/<builder>/<number>",
  // otherwise returns "<id>"
  //
  // See also ParseBuildAddress.