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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 kata's description has been rephrased like this: "It should make the conversion if the given string only contains a single integer value". Hopefully it is clearer.
Thanks for the feedback! :)
Are you referring to an input string that would contain several valid values like
"1 2 3"?