// checks if the lisence number is already in the garage and redirect accordingly
private void checkLisenceNumber()
{
string ownerLisenceNumber = UserInterface.GetLisenceNumber();
if (garageClients.ContainsKey(ownerLisenceNumber))
{
updateExistingClient(ownerLisenceNumber);
}
else
{
insertNewVehicle(ownerLisenceNumber);
}
}
