private function handleRemainder($string)
    {
        $write = $this->remainder . $string;
        $nRem = strlen($write) % 45;
        $this->remainder = '';
        if ($nRem !== 0) {
            $this->remainder = substr($write, -$nRem);
            $write = substr($write, 0, -$nRem);
        }
        return $write;
    }