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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.
Since you only fail random tests I suppose you mutate the input.
2925 people passed the Java kata so I can't think that the tests are broken. I tried a few solutions without problems. Cheers.