The most delicious Three Chocolate Cake

Preparing a chocolate sponge cake. The oil should be at room temperature. Beat it with sugar 30 g, add melted dark chocolate, salt, beat again. Stir in the yolks, beat.
Beat the whites with 130g sugar separately until peaks.
Sift the flour and mix it with vanilla and baking powder.
Combine carefully all three masses, mix gently.
Grease a mold 24cm in diameter with oil, pour in the dough, bake at 160C for about half an hour. Check the readiness of the cake with a toothpick. If there are no lumps left on it, then the cake is baked.
Cool the cake, remove it from the mold and cut it in a circle so that there is a gap between the mold and the cake - it will need to be filled after.
Soak the cake with cream liqueur and put it in the freezer.
At this time, start cooking mousse.
Soak gelatin for all three mousses in cold cream. You will get 24 grams of gelatin and 50 ml of cream. Then divide the gelatin layer into 3 parts.
Beat 600 grams of cream until stable, divide into 3 parts and put in the refrigerator.
Break the dark chocolate into pieces, heat it in a water bath, adding oil. Add gelatin and bring it to complete dissolution, stirring. Do not bring to a boil. Pour in the liqueur, stir, let the mass cool slightly, then mix it with whipped cream (1/3 part).
Take out the biscuit. Lay the mold from the inside with a film so that the film extends beyond the mold by 7 cm. Put the sponge cake on top and pour the dark chocolate mousse into the gap between the cake and the sides. Smooth it out and put it in the refrigerator.
On the same principle, cook the other two mousses. Then pour them into the mold on top of the cake. First pour the milk chocolate mousse, then the white one.
Keep the cake in the refrigerator overnight. This is necessary for the gelatin to grasp well.
White chocolate glaze: heat cream with butter to a boil, add white chocolate, stir until dissolved. Pour the icing over the cake in the form so that a uniform and even layer is obtained. And put the cake in the refrigerator for an hour. Then remove the cake from the mold and serve. Decorate the top as desired.