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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.
Out of spec, so who cares.
I tested all cases on ruby in my machine and the '£' test passed with my solution, but attending your comments I decided to remove it from the tests.
I have tested that specific string "1£^%1" with my solution and is working. I'll try to figure out if there is something else I could do
That test has been fixed, thanks for your comment