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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.
Already fixed it.
Ruby, detected by the post from
amedeomajerbelow: tests are susceptible to input mutation.That's because strings are mutable in Ruby, and you're mutating the input, changing the expected value. Now it doesn't happen anymore, but you should fix your code to make it work.
the expected result for the last test is wrong,
the fourth to last number is always different than the input one.
example:
cc = "65473632678289"
expented output = "##########4289"