public async Task <ActionResult <Equipment> > GetEquipment(int id)
        {
            var equipment = await _repository.GetEquipment(id);

            if (equipment == null)
            {
                return(NotFound());
            }

            return(equipment);
        }
        private async Task <List <Equipment> > CheckEquipment(List <CreateRental> items)
        {
            var equipment = new List <Equipment>();

            foreach (var item in items)
            {
                var eq = await _equipmentsRepository.GetEquipment(item.EquipmentId);

                if (eq == null)
                {
                    return(null);
                }

                if (!equipment.Contains(eq))
                {
                    equipment.Add(eq);
                }
            }

            return(equipment);
        }