const phoneNumberFormatter = function(number) {
// 1. Menghilangkan karakter selain angka
let formatted = number.replace(/\D/g, '');
// 2. Menghilangkan angka 0 di depan (prefix)
// Kemudian diganti dengan 62
if (formatted.startsWith('0')) {
formatted = formatted.substr(1);
}
if (formatted.startsWith('62')) {
formatted = formatted.substr(2);
}
if (formatted.endsWith('@c.us')) {
formatted += '@c.us';
}
return formatted;
}
console.log(phoneNumberFormatter('085747290615'))