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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.
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This test should be added to the default suite
Some currently valid solutions fail on it
test.assert_equals(to_underscore("123"), "123")
I'm not sure what this Kata is testing.
I think we should add a test like: _2_CamelCase1
Becouse while testing I came up with a code that manages to strip first underscore in this particular case and it went through.