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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Not sure what your question is, but seems like you've solved it, so closing...
The
IsAsciiLetterLoweris available since .NET 7 and IIRC Codewars uses .NET 6.If you want help with solving the kata, mark your comment as a
questioninstead, and specify what you need help with. Theissuelabel is reserved for issues with the kata itself.This is not how you post an
issue. You've said nothing about any potential problem with the kata, instead just posted a incomplete portion of your code. I'm not sure kind of action do you actually expect to result from this...