Bake the white cake following the instructions on the box. Use the 9 inch springform pan. Let it cool. Mix the heavy cream until firm and mix the cream cheese with confectioners sugar in the separate ball. Combine those two and spread it over the white cake. Cut the strawberries in pieces and cook with sugar over the medium heat. Dissolve the pudding powder in water and add to the strawberries while stirring. Stir until it thickens. Let it cool to room temperature and occasionally stir. Spread it over the top and garnish with some strawberries. Refrigerate for two hours at least.