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    you can assume that the input data is always a string, no need to verify it.

    It only says the input will be a string, but an empty string is still a valid string :/

    I don't think it's an issue TBH. It would be up to the author if he wanted to modify description, or add enother example, but he's gone for a while now. If you feel the need for it, you could raise a suggestion about this.

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    What's the input that could cause that error? What do you think?

    You're not running the same tests locally (because there's more tests than the ones you see), so you didn't catch this edge case.

    Your code failing is not a kata issue, but feel free to reply if you can't figure it out.