public static function split($rut, $vn = null)
    {
        if (!is_null($vn)) {
            return [$rut, $vn];
        }
        $vn = (substr($rut, -1));//Get the last character
        $rut = substr($rut, 0, -1); //Remove tha last char from the rut

        return [$rut, $vn];
    }