}
        }
        return sb.toString();
    }

    private static char hankakuKatakanaToZenkakuKatakana(final char c) {
        if (c >= HANKAKU_KATAKANA_FIRST_CHAR && c <= HANKAKU_KATAKANA_LAST_CHAR) {
            return ZENKAKU_KATAKANA[c - HANKAKU_KATAKANA_FIRST_CHAR];
        }
        return c;
    }

    public static char mergeChar(final char c1, final char c2) {
        if (c2 == 'ﾞ') {