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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.
Duplicate issue
This comment is hidden because it contains spoiler information about the solution
In Kotlin the test cases of assertEquals are in the wrong order.
It should be (for example):
assertEquals("foobar001", incrementString("foobar000"))instead of
assertEquals(incrementString("foobar000"), "foobar001")