How To Make a Chocolate Strawberry Cake - sharp cake edges

amazing chocolate cake :\r
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Recipe :\r
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1 1/2 cup of sugar\r
1 3/4 cups All purpose flour\r
2 teaspoons baking powder\r
1/2 teaspoon baking soda\r
1/4 teaspoon cinnamon powder\r
pinch of salt\r
1/4 teaspoon instant coffee granules(optional)\r
1/2 teaspoon whiskey (optional)\r
1 cup of butter\r
1 1/2 cup of yogurt\r
3/4 cups of cocoa powder\r
2 Large eggs \r
1 teaspoon vanilla extr\r
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Buttercream:\r
6 Large egg whites\r
1 1/2 cups of regular sugar\r
2 cups of sifted powder sugar\r
1 tsp vanilla extr\r
400 grams of room temp butter (15 oz.)\r
3/4 cups of shortening \r
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+ 5 tablespoons of strawberry jam\r
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Flavored whipped cream recipe:\r
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2 cups of heavy cream\r
40 grams of powdered sugar\r
2 tablespoons strawberry flavored custard mix\r
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simple syrup recipe:\r
400 grams of sugar\r
500 ml of water\r
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Jello topping:\r
1 package of Jello\r
1/2 a cup of boiling water