private void moveCurrentCarToCarHistory(Employee employee) {
    Car currentCar = carRepository.findOne(employee.getCurrentCar().getId());
    Set<Car> carHistory = employee.getCarHistory();
    carHistory.add(employee.getCurrentCar());

    if (currentCar.getEndLeasing().isAfter(LocalDate.now())
        && !(currentCar.getEndLeasing().isEqual(LocalDate.now()))) {
      currentCar.setInThePool(true);
    }
    carRepository.save(currentCar);
  }
  @Override
  public CarDTO assignPoolCarToEmployee(EmployeeDTO employeeDTO, CarDTO carDTO) {
    Employee employee = employeeRepository.findOneByEmail(employeeDTO.getEmail()).get();

    updatePoolCar(carRepository.findOne(carDTO.getId()));
    Car currentCar = employee.getCurrentCar();

    if (currentCar != null) {
      Set<Car> carHistory = employee.getCarHistory();
      currentCar.setEndLeasing(LocalDate.now());
      carHistory.add(currentCar);
    }
    employee.setCurrentCar(carRepository.findOne(carDTO.getId()));
    employee.setReceivedMailForNewCar(false);
    employeeRepository.save(employee);
    return carDTO;
  }