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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.
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That's not a kata issue, rather a question.
The brackets show the place where your answer and expected answer differ. It seems that there is an extra space at the end in your solution.
You can always print the input to console: see this article
Hi people. I have this kind of problem expected:<...netnes is a ecnetnes[]> but was:<...netnes is a ecnetnes[ ]>. But I put into test on expected this "...netnes is a ecnetnes[ ]" (without braces of course). But I cannot figure out what must be on input to make this error. Any ideas? (Java)