Exercises G26

Description:
The game would not add the diamonds from the competed challenges when level 15 is reached.

Test steps:
1.Open the game.
2.Choose one challenge.
3.Play until level 15.
4.Check the total number of diamonds.

Expected result:
When level 15 is reached the diamonds from the completed challenges should be added to the total diamond number that is calculated 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.