@Override
    public String toString() {
      if (Strings.isNullOrEmpty(issuer) || (name.startsWith(issuer + ":"))) {
        return name;
      }
      return issuer + ":" + name;
    }
If the {@code issuer} is set, returns a fully qualified string of the form {@code
"issuer:name"}, e.g., {@code "Google:bob@example.com"}. If no {@code issuer} is set, returns
just the account name.
java/com/google/android/apps/authenticator/otp/AccountDb.java