withCustomerServed method
Returns a new state with customersServed incremented by 1.
Implementation
SplitEquallyState withCustomerServed() {
return SplitEquallyState(
numberOfCustomers: numberOfCustomers,
totalCents: totalCents,
baseShareCents: baseShareCents,
lastShareCents: lastShareCents,
customersServed: customersServed + 1,
);
}