public void insert(String data) {
        this.insert(this.root, data);
    }
@Test
    public void prefixSearch44() throws Exception {
        TrieTree trieTree = new TrieTree();
        trieTree.insert("a");
        trieTree.insert("b");
        trieTree.insert("c");
        trieTree.insert("d");
        trieTree.insert("e");
        trieTree.insert("f");
        trieTree.insert("g");
        trieTree.insert("h");

    }