public async Task <ActionResult <IEnumerable <VisitorReadDto> > > GetAllVisitors()
        {
            var visitorItems = await _repository.GetAllAsync();

            if (visitorItems != null)
            {
                return(Ok(_mapper.Map <IEnumerable <VisitorReadDto> >(visitorItems)));
            }
            else
            {
                return(NotFound());
            }
        }