Kata has been updated.

Thanks for your feedback.

Thanks for the feebacks, description has been updated.

I changed the kata name to be more accurate.

Tags have been updated, thanks for the feedback.

Yes, I've changed the category to "puzzle".

Thanks for the information, I didn't knew all of it.
I don't understand how the user can change the input.
Could you show me a code example?
I've tried to fix the translation, please let me know if I succeed or not.

Hi!
I don't understand what you mean by "user can modify the input"

I've updated the translation in order to make the global functions private.
Not sure of the whole thing, I don't have much experience in crystal

Thank you for your answer, this was a code golf I found and had a really good time answering it.
Was thinking about giving credits but the source contains solutions.

Anyway, I will work on better content next time

Thanks for the review, random tests have been added.

Thanks for the review, random tests have been added.

The kata is taken from the famously know suite of Euler challenges, i've checked before for duplicates. If I made a mistake, I will unpublish quickly.

I found this kata very instructing however, IMHO this is not a 7kyu one.

Also could benefit a few more test cases.

Thanks to op!