Why this code is not working

Question

https://code.sololearn.com/cB1we7AlOpK0/?ref=app

Answer 1

strrev () ; function not working on solo ide . You can use this function in VS code your program will run without error.
and don't use gets to take input from user .it will give warnings becoz this function is removed from modern c,cpp.

Answer 2

Which function i use for receiving data in string...