protected function rebuildTitle($index, $word)
    {
        $this->title =
            mb_substr($this->title, 0, $index, $this->encoding) .
            $word .
            mb_substr(
                $this->title,
                $index + mb_strlen($word, $this->encoding),
                mb_strlen($this->title, $this->encoding),
                $this->encoding
            );
    }