Solve this please

Question

https://code.sololearn.com/cR9VGWlFbYz3/?ref=app

Answer 1

@Immortal is right
s is a character, not a string
yes is a variable/macro/function/type name, not a value
you can't directly compare strings in C (you need strcmp function, I let you document yourself on the internet, it is easy to find ;))