finished intra calculation

tests/services/test_Surplus.cpp

@@ -10,6 +10,7 @@ TEST_CASE("Testing add function")
 {
  std::vector<std::unique_ptr<Community>> communities;
  communities.push_back(Factory::create_test_community());
- Surplus::CalculateSurplus(communities);
+ Surplus surplus(communities);
+ surplus.CalculateSurplus();
  CHECK(true);
 }