Why it doesn't work the function "strrev" in my code?

Question

https://code.sololearn.com/cHrdKU813Bq6/?ref=app

Answer 1

It has to do with compiler (check the following post ) .

https://www.csestack.org/undefined-reference-to-strrev/

Answer 2

I see, thanks Abhay :)

Answer 3

Thanks Martin Taylor :)