public ExperienceViewModel IncrementExperience(int quantity)
{
var previousExperience = _experienceRepository.CurrentExperience();
var actualExperience = previousExperience + quantity;
if (HasReachedNewLevel(actualExperience))
{
LevelUp(actualExperience);
}
else
{
_experienceRepository.SetExperience(actualExperience);
}
return(BuildCurrentExperienceViewModel());
}