TASK = print all Rooms inside of "rooms_" vector

handler.h
include rs.h

class Handler {
private:
    ReservationSystem rs_; // no access to private vectors in ReservationSystem.h
    if I made a method here then I wont have access to RS private vectors
}
==================================================

rs.h

class RS {
private:
    std::vector <Room> rooms_;
    if method added here then it wont be possible to call it inside Handler class because of private
}