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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.
Some test cases proposed by @tannah should be added to the problem.
At least these 3
Test.assertEquals(sumStrings('0', '0'), '0');
Test.assertEquals(sumStrings('0001', '002'), '3');
Test.assertEquals(sumStrings('712569312664357328695151392712569312664357328695151392', '1'), '712569312664357328695151392712569312664357328695151393');
I believe, some of these should be added to problem test cases especially
Test.assertEquals(sumStrings('0', '0'), '0');
Test.assertEquals(sumStrings('0001', '002'), '3');
Test.assertEquals(sumStrings('712569312664357328695151392712569312664357328695151392', '1'), '712569312664357328695151392712569312664357328695151393');
I'll file an issue for this