Normalizes an email address. It removes tags, separators like +something
and .
in Gmail.
Inspired by https://github.com/imliam/php-unique-gmail-address :heavy_check_mark:
composer require szepeviktor/unique-email-address
$gmail = new Gmail();
$address = 'firstname.LASTname+label@gmail.com';
$gmail->isLocal($address); // true
$gmail->normalize($address); // 'firstnamelastname@gmail.com'