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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.
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El resultado está claro, pero... faltaría por declarar la librería a la que corresponde la función"abs()", es decir: #include <math.h>.
I think that the result/return is understandable, but... you have not declared the library for the use of the "abs()" function, I mean: #include <math.h>.
Thanks a lot for your solution!