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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.
The description says "The method only needs to be able to convert positiv[e] numbers", however one of the test cases in the Java version tests for 0, which is not a positive number. The description should be updated to say that the method does not need to be able to convert negative numbers.