c++ vectors practise

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

int main()
{
    string word = "turpentine and turtles";
    vector <char> vowels = { 'a','e','i','o','u' };
    vector <char> result;
    for (int i = 0; i < word.size();i++)
    {
        for (int j = 0; j < vowels.size();j++)
        {
            if (word[i] == vowels[j])
            {
                result.push_back(word[i]);
                if (word[i] == 'e' || word[i] == 'u') {

                    result.push_back(word[i]);
                }
            }

        }

    }
    for (int k = 0; k < result.size();k++)
        {
            cout << result[k];
        }
}