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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.
It's a regex pattern meaning "one or more whitespace character(s)".
same bro for me also just " " in place of null..in more complex tests
for me
Expected: is "E"
but: was " E"
Print the input, check why your code is failing.