/*  Create a function that takes a string as its argument 
 ~  and returns the string in reversed order.
 */
std::string reverse(std::string str) {
	std::string s = "";
	// get length of "str" 
	int len = str.size();
	// loop over "str" to reverse it
	for (int i=0; i < len; i++) {
		s += str.back();
		// str = last + str;
		str.pop_back();
	}
	return s;
}