void swap(int* a, int* b)
{
    int tmp = *a;
    *a = *b;
    *b = tmp;
}

void bubbleSort(Weight* data, const size_t length) {
    int tmp1, tmp2;
    for (int i = 0; i < length - 1; i++)
    {
        for (int j = 0; j < length - 1 - i; j++)
        {
            tmp1 = data[j]->product + data[j]->packing;
            tmp2 = data[j+1]->product + data[j+1]->packing;
            if (tmp1 < tmp2)
            {
                swap(data + j, data + j + 1); //pointer aritmetics
            }
        }
    }
}