Double a

#include <iostream>
#include <string.h>
using namespace std;

void double_a(char string[], char result[])
{
    int counter = 0;

    for (int i = 0; i < strlen(string); i++)
    {
        if (string[i] == 'a')
        {
            result[counter] = 'a';
            result[counter + 1] = 'a';
            counter += 2;
        }

        else
        {
            result[counter] = string[i];
            counter++;
        }
    }

    result[counter] = 0;
}

int main()
{
    char base[30] = "Yoona eats flowers";
    char new_base[30];
    double_a(base, new_base);
    cout << new_base;
}