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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.
Your code is buggy. It performs incorrect operations for this test case:
Assert::That(string_expansion("1a1"), Equals("a"));
.Your solution has a bug, it's not a kata issue.
yes, you can post your code here, just remember to use code blocks.
This means that most probably strings returned by you are corrupted in some way at the end. It's difficult to tell how exactly without seeing your code.
Pretty sure it's not impossible.