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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.
Despite passing the tests I get a 'Cannot invoke "String.isEmpty()" because "str" is null' error when I attempt. I didn't have a String named str but I made an empty one, same thing. Can't see the tests throwing the error so I'm not sure what I can do to find what isn't working.
Training in java 17 if that makes a difference.