Easy Pineapple Cake

1 can crushed pineapple (20oz (do not drain))

1 carton thawed cool whip (8oz)

1 box instant vanilla pudding (4 serving size (3.4oz))

1 pound cake (16oz or angel food cake if desired)

1/3 cup amaretto liquor

Garnish as desired with slices of pineapple (toasted almonds or maraschino cherries)