Chocolate cake with chocolate filling and frosting

This cake is delicious, that chocolate sprinkles inside is divine,
that frosting after hours is hard and crunchy, try to make it and tell me.
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Ingredients
4 eggs
1 cup of sugar
1/2 cup oil
1/2 cup of water
2 spoons of cocoa powder
2 spoons of corn starch
1 1/2 cup flour
1 spoon of baking powder
1/2 cup granulated chocolate
chocolate bar for topping