Giant Pizza Slice Cake

Name: Giant Pizza Slice Cake
Ingredients: Nonstick cooking spray; One 15.25-ounce box yellow cake mix, such as Duncan Hines; One 3.4-ounce package instant vanilla pudding mix; 4 large egg whites; 1/2 cup vegetable oil; 2 1/4 cups sugar; 2 tablespoons lemon juice; Pinch fine salt; 12 large egg whites; 9 sticks (2 pounds and 4 ounces)) unsalted butter, cut into 1 1/2-inch chunks, at room temperature; 1 tablespoon vanilla extract; Red, yellow, orange and ivory gel food coloring, for decrorating; 1 tablespoon alcohol spirits, such as vodka; 5 red cherry, strawberry or raspberry flavored fruit leather rollups, such as Fruit Roll-Ups