public override int Leave(string CarNumber)
{
if (!validate.ValidateNumber(CarNumber))
{
throw new Exception(CarNumber + " is not valid");
}
for (int index = 0; index < Cars.Length; index++)
{
var car = Cars[index];
if (car == CarNumber.ToUpper())
{
Cars[index] = string.Empty;
return(index + 1);
}
}
return(-1);
}
