preparePhone static method
Implementation
static String preparePhone(String phone) {
String phoneNumber = phone;
if (phone.startsWith('0')) {
phoneNumber = '+84${phone.substring(1)}';
} else if (phone.startsWith('84')) {
phoneNumber = '+$phone';
} else if (!phone.startsWith('+84')) {
phoneNumber = '+84$phone';
}
return phoneNumber;
}