Layered Chocolate Fudge Cake

CAKE 1 1/2 cups sugar 1 1/4 cups all-purpose flour 3/4 cup unsweetened cocoa powder 2 1/2 teaspoons baking powder 1 1/2 teaspoons baking soda 1/8 teaspoon salt 1 cup buttermilk 3 large eggs 2 1/2 teaspoons pure...