* <p>This method iterates through the provided array of SuggestItem objects and merges
     * items that have the same ID. The merged items are added to a new list, which is then
     * converted back to an array and returned.</p>
     *
     * @param items an array of SuggestItem objects to be merged
     * @return an array of merged SuggestItem objects
     */
    default SuggestItem[] mergeItems(final SuggestItem[] items) {

        return c;
    }

    /**
     * Merges two characters, handling voiced and semi-voiced sound marks.
     * @param c1 The first character.
     * @param c2 The second character.
     * @return The merged character.
     */
    public static char mergeChar(final char c1, final char c2) {
        if (c2 == 'ﾞ') {
            if ("ｶｷｸｹｺｻｼｽｾｿﾀﾁﾂﾃﾄﾊﾋﾌﾍﾎ".indexOf(c1) >= 0) {
                switch (c1) {