转换错误：一个大西瓜切两半->1个大西瓜切20.5

[ALLinLLM]

Describe the bug
转换错误：一个大西瓜切两半->1个大西瓜切20.5

To Reproduce
Steps to reproduce the behavior:

1. run following code:

    import cn2an

    result = cn2an.transform(input_sentence)
    print(result)

2. See error

Expected behavior
1个大西瓜切2半

Screenshots

Additional context
Add any other context about the problem here.