/* Car.java */
public class Car {
    private List<WheelPosition> wheelPositions;
    
    // constructors, getters, setters etc

/* CarDto.java */
public record CarDto(List<String> wheelPositions) {}

/* CarAndWheelMapper.java */
@Mapper
public interface CarAndWheelMapper {
    String stringFromWheelPosition(WheelPosition source);
    
    WheelPosition wheelPositionFromString(String source);
    
    CarDto carDtoFromCar(Car source);
    
    Car carFromCarDto(CarDto source);
}

/* CarAndWheelMapperJavaImpl.java */
@Override
public CarDto carDtoFromCar(Car source) {
    if ( source  == null ) {
        return null;
    }
    
    wheelPositions = wheelPositionListToStringList( source.getWheelPositions() );
    
    CarDto carDto = new CarDto( wheelPositions );
    
    return carDto;
}