This is a really easy task and if you cannot do it yourself then you should ask why you are on a programming course in the first place.
Here's a major hint. Look at the string "Hello olleH". What do you notice about characters  and [strlen-1]? What do you notice about  and [strlen-2]? And in general [n] and [strlen-1-n]? HINT HINT HINT ***for loop***. You can do it in about 6 lines of code, and you don't need to reverse the string to be able to tell if it's a palindrome.