code: func base64Decode(s string) (string, error) {
  	v, err := base64.StdEncoding.DecodeString(s)
  	if err != nil {
  		return "", errors.Wrap(err, "base64Decode")
  	}
  	return string(v), nil
  }
docs: // base64Decode decodes the given string as a base64 string, returning an error
  // if it fails.