Added logic surplus calculation intrabuilding wise

src/model/Community.cpp

@@ -24,3 +24,10 @@ Energy_Tariff Community::energy_tariff() const {
 void Community::set_energy_tariff(const Energy_Tariff& energy_tariff) {
     energy_Tariff = energy_tariff;
 }
+
+void Community::iterateCommunities(std::vector<std::shared_ptr<Community>> &communities,
+                                 const std::function<void(std::shared_ptr<Community>&)> &function) {
+    for (auto &community : communities) {
+        function(community);
+    }
+}