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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.
The problem statement explicitly declares that there will only be a lowercase letter as input.
I like the logic behind your solution. Very similar to mine
Clever coming from the kata creator
This solution is forcing lowercase to account for the case-insensitive constraint. Also, your solution is being redundant by checking for a bool value to return a bool value.