// TODO: implement this method (in an iterative way)
public void mergeSort(Card[] cardArray)
    {
        // TODO: implement this method (in an iterative way)
    }
public void mergeSort(Card[] cardArray)
{
// TODO: implement this method (in an iterative way)
}
public void mergeSort(Card[] cardArray)
{
// TODO: implement this method (in an iterative way)
}
public void mergeSort(Card[] cardArray)
{
// TODO: implement this method (in an iterative way)
}