C-Code

#include "vowels.h"

int main()
{
    string s{ "trAInyOUrprOgrAmmEr" };
    vowels v{ s };
    cout << v.reverse_vowels(s) << endl;
}

C-Code

#pragma once
#include <iostream>
#include <vector>
#include <string>
using namespace std;

class vowels
{
private:
	string str_;
public:
	vowels(string str) :str_{ str } {}
	string reverse_vowels(string);
};

C-Code

#include "vowels.h"

string vowels::reverse_vowels(string s)
{
    vector<char> v1{ 'A','a','E','e','I','i','O','o','U','u' }, v2, v3;
    auto p{ 0 };

    for (auto i = (str_.length() -1); i > 0 ; i--)
        if (find(v1.begin(), v1.end(), str_[i]) != v1.end())
            v2.push_back(str_[i]);

    for (const auto& i : str_)
        v3.push_back(find(v1.begin(), v1.end(), i) != v1.end() ? v2[p++] : i);

    string ns(v3.begin(), v3.end());
    return ns;
}