What I'm doing wrong in this code? Correct me if you are interested

Question

https://code.sololearn.com/cVD2rR6sgP9y/?ref=app

Answer 1

https://code.sololearn.com/ctChlFF0csQa/?ref=app

Answer 2

It's int main(), not '['Wmain']' main(). Also you cant put strings in switch statements. You should use gets() before puts() too.