Reformatting code

src/main/java/io/ds/myaktion/MyaktionApplication.java

src/main/java/io/ds/myaktion/domain/Account.java

src/main/java/io/ds/myaktion/domain/Campaign.java

src/main/java/io/ds/myaktion/domain/CampaignRepository.java

src/main/java/io/ds/myaktion/domain/Donation.java

src/main/java/io/ds/myaktion/domain/DonationRepository.java

.../io/ds/myaktion/exceptions/CampaignNotFoundException.java

src/main/java/io/ds/myaktion/services/CampaignService.java

src/main/java/io/ds/myaktion/services/DonationService.java