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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 entire string shouldn't necessarily be lowered either; chars could be lowered as you go. It's pointless lowering the whole of
aABCDEFGHIJKLMNOPQRSTUVWXYZif you're going to detect a non-isogram on str[1]The only limit is your PC memory