[bug]Whether QueryByPrefix does not conform to the api definition？

[songzhibin97]

func TestTrie_FindByPrefix(t *testing.T) {
	trie := New[string]()
	_ = trie.Upsert("china", "china")
	_ = trie.Upsert("chinese", "chinese")
	_ = trie.Upsert("channel", "channel")
	_ = trie.Upsert("chan", "chan")
	_ = trie.Upsert("boy", "boy")
	_ = trie.Upsert("cc11001100", "CC11001100")

	slice := trie.QueryByPrefix("c") // len(slice) is 0
	//t.Log(slice)
	assert.Equal(t, 5, len(slice))
}

QueryByPrefix 根据前缀查询单词, 如果不是一个具体的单词会直接返回错误，不符合api定义的预期