Exercises G25

Steps to reproduce:
1. Open the app.
2. Observe the starting number of diamonds.
3. Reach level 15.
4. Calculate the number of diamonds that you should have after completing challenges until level 15.
5. Check if the diamonds from completed challenges is added to the total diamond number from the start of the game.

Actual result:
When level 15 is reached the diamonds from the completed challenges are not added to the total diamond number that was calculated from the start of the game. 

Expected result:
The number of diamonds from completed challenges should be added to the total diamond number.