void pretty_print_heap(FILE* out, const int* v, unsigned n)
{
    int w = ints_width(v, n - 1);
    int count = 0;
    int nbline = 0;
    count++;
    for (unsigned j = 0; j < n; j = 2 * j + 1)
    {
         nbline++;
    }
    int plus = w + 1;
    int t = (plus) * pow(2, nbline - 1);
    int g = 0;
    for (unsigned i = 0; i < n; i = i)
    {
        int did = 0;
        int s = t / count - w;
        int to_floor = (s / 2);
        int nbspaces = floor(to_floor);
        for (int h = 0; h < nbspaces; h++)
            fprintf(out, " ");
        int test = g;
        for (int l = g; l < count + test && i < n; l++)
        {
            if (g != 0 && did == 1)
            {
                for (int k = 0; k < s; k++)
                    fprintf(out, " ");
            }
            for (int u = int_width(v[l]); u < w; u++)
                fprintf(out, " ");
            i++;
            g++;
            did = 1;
            fprintf(out,"%d" ,v[l]);
        }
        fprintf(out, "\n");
        count = count * 2;
    }
}