Given a string s, reverse only all the vowels in the string and return it. The vowels are 'a', 'e', 'i', 'o', and 'u', and they can appear in both lower and upper cases, more than once.

In this lab, your task is to implement a reverseString method that takes a string as input and returns its reverse without using any built-in string reversal functions. This method should be static ...