Candy cake with candy sauce

Here’s the ingredient list :

For the Cake:
2 ½ cups special cake flour
2 ½ teaspoons baking powder
¼ teaspoon baking soda
½ teaspoon coarse salt
1 cup unsalted butter, room temperature
2 cups granulated sugar
4 egg yolks
1 tablespoon vanilla extract
1 cup whey (buttermilk), room temperature
2 egg whites
For the Caramel Sauce:
¾ cup unsalted butter
2 cans evaporated milk (12 oz each)
2 cups granulated sugar
½ teaspoon coarse salt
1 teaspoon vanilla extract (optional)

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