public string FuelNormalVehicle(string i_LicenseNumber, string i_FuelType, float i_LitresToAdd)
        {
            Vehicle vehicle = SearchVehicle(i_LicenseNumber);

            if (vehicle != null)
            {
                try
                {
                    vehicle.FillUp(i_FuelType, i_LitresToAdd);
                    return("Vehicle was successfully fueled");
                }
                catch (ValueOutOfRangeException e)
                {
                    throw new ValueOutOfRangeException(e, 0, 0, 1);
                    return("Could not fuel vehicle");
                }
            }
            else
            {
                return("Vehicle was not found");
            }
        }
        public string ChargeElectricVehicle(string i_LicenseNumber, float i_NumberOfMinutes)
        {
            Vehicle vehicle = SearchVehicle(i_LicenseNumber);

            if (vehicle != null)
            {
                try
                {
                    vehicle.FillUp(i_NumberOfMinutes);
                    return("Vehicle was successfully charged");
                }
                catch (ValueOutOfRangeException e)
                {
                    throw new ValueOutOfRangeException(e, 0, 0, 1);
                    return("Could not charge vehicle");
                }
            }
            else
            {
                return("Vehicle was not found");
            }
        }