Переписать, используя struct Stack, pop, push

#include <iostream>
#include <cstring>
#include <stack>
using namespace std;
 
bool isLetter(char symb) {
 
    return (symb >= 'A' && symb <= 'Z') || (symb >= 'a' && symb <= 'z');
 
}
 
bool isVowel(char letter)
 
{
    if (('a' == letter) || ('o' == letter) || ('u' == letter) || ('e' == letter) || ('i' == letter) || ('y' == letter))
    {
        return true;
    }
    if (('A' == letter) || ('O' == letter) || ('U' == letter) || ('E' == letter) || ('I' == letter) || ('Y' == letter))
    {
        return true;
    }
    return false;
}
 
int main()
{
    setlocale(LC_ALL, "rus");
 
    stack <char> steck;
 
 
 
    const int numb_of_symbols = 6;
 
    int i = 0;
 
 
 
    cout << "Введите шесть любых букв: " << endl;
 
 
 
    while (i != numb_of_symbols)
 
    {
 
        char a;
 
        cin >> a;
 
 
 
        steck.push(a);  // добавляем введенные буквы
 
        i++;
 
    }
 
 
 
    if (steck.empty()) 
 
    {
 
        cout << "Стек пуст";  // проверяем пуст ли стек
 
        return -1;
 
    }
 
 
 
    char vowels[numb_of_symbols];
 
    char consonants[numb_of_symbols];
 
 
 
    int vowels_index = 0;
 
    int consonants_index = 0;
 
    while (!steck.empty()) 
 
    {
 
        char topElement = steck.top();
 
        if (isLetter(topElement) && isVowel(topElement)) {
 
            //cout << "It's a vowel!" << endl;
 
            if (vowels_index < numb_of_symbols) {
 
                vowels[vowels_index] = topElement;
 
            }
 
            vowels_index++;
 
        }
 
        else if (isLetter(topElement) && !isVowel(topElement)) {
 
            //cout << "It's a consonant!" << endl;
 
            if (consonants_index < numb_of_symbols) {
 
                consonants[consonants_index] = topElement;
 
            }
 
            consonants_index++;
 
        }
 
        steck.pop();
 
    }
 
 
 
    if (consonants_index == 0 && vowels_index == 0) {
 
        cout << "There's no data to output!" << endl;
 
        return -1;
 
    }
 
 
 
    if (vowels_index > 0 && consonants_index == 0) {
 
        for (int i = 0; i < vowels_index; i++) {
 
            cout << vowels[i] << endl;
 
        }
 
        cout << "Only vowels" << endl;
 
        return 0;
 
    }
 
 
 
    if (vowels_index == 0 && consonants_index > 0) {
 
        for (int i = 0; i < consonants_index; i++) {
 
            cout << consonants[i] << endl;
 
        }
 
        cout << "Only consonants" << endl;
 
        return 0;
 
    }
 
 
 
    int index = 0;
 
    char result[numb_of_symbols];
 
    for (int i = 0; i < vowels_index; i++) {
 
        result[index] = vowels[i];
 
        index += 2;
 
    }
 
 
 
    index = 1;
 
    for (int i = 0; i < consonants_index; i++) {
 
        if (!isLetter(result[index - 1])) {
 
            result[index - 1] = consonants[i];
 
        }
 
        else {
 
            result[index] = consonants[i];
 
            index += 2;
 
        }
 
    }
 
 
 
    cout << "Result: " << endl;
 
    for (int i = 0; i < vowels_index + consonants_index; i++) {
 
        cout << result[i] << " ";
 
    }
 
    cout << endl;
 
 
 
    system("pause");
 
    return 0;
 
}