Move Vehicle class to vehicle.h
Move implement of distance function() to fleet.h
Move Vehicle::can_visit() to vehicle.h
Move Vehicle::mileage() to vehicle.h
Move operator<< to vehicle.h
Move Vehicle::distance() to vehicle.h
Delete the data member of Vehicle class
Move implement of Vehicle::visit() to vehicle.h
Delete
Fix nearest_neighbor_insertion
Fix visit_randomly
Change Vehicle class to template class
Indent
Change Fleet class to template class