Reverse a String

You are given a string s. You need to reverse the string.

Example 1:

Input:
s = Geeks
Output: skeeG

Example 2:

Input:
s = for
Output: rof

Your Task:

You only need to complete the function reverseWord() that takes s as parameter and returns the reversed string.

Expected Time Complexity: O(|S|). Expected Auxiliary Space: O(1).

Constraints: 1 <= |s| <= 10000