parseGroup function

String parseGroup(
  1. String phone
)

parseGroup will try to convert group number in required format

Implementation

String parseGroup(String phone) {
  String groupSuffix = "@g.us";
  String phoneNum = phone.replaceAll("+", "");
  // Already has a valid WA suffix — leave as-is
  if (phoneNum.contains("@")) {
    return phoneNum;
  }
  return "$phoneNum$groupSuffix";
}