public ActionResult CreateOwner([FromBody] NewCarOwner ownerRequest)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest("Model state not valid"));
            }
            var model = new CarOwner
            {
                CarId        = ownerRequest.CarId,
                Period       = ownerRequest.Period,
                Owner        = ownerRequest.Owner,
                OwnerContent = ownerRequest.OwnerContent,
            };

            _carService.AddCarOwner(model);
            return(Ok($"Car owner created: {model.Owner}"));
        }