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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.
Same I also did this but with string since it's the return type and it wouldn't work so I wrote an if statement with the replace method inside instead.
you might have forgotten to write Replace with a capital R.
there's no way you literally did this and it didn't work