The following is a virtual vending machine simulator that meets the following requirements:

$1.$The customer can input the following coins: $5-$cent, $10-$cent, $25-$

cent.

$2.$ When $75$ cents is input, the machine will activate the dispenser

and permit the customer to select a product.

$3.$ When at least $75$ cents is input no more coins will be accepted.

$4.$ Change will be returned to the customer if more than $75$ cents

is deposited.

$5.$ A reset button will return the customer$$s money.

$6.$ When a product is dispensed, $75$ cents will be added to the

machine$$s $$Total Money Collected$$ register.

$7.$ No product is dispensed if less than $75$ cents is deposited.

$8.$ The current number of items available for each product is stored

in a counter.

$9.$ When a service technician restocks the machine the item count

for each product is set to $15,$ which is the maximum number of

items that can be stocked.

$10.$ If the number of products available is zero for any one product

the machine will light a $$sold out$$ light and no action will be

taken if that product is selected.

This circuit uses only combinational logic and is an example of a

reasonably complex system.

Unfortunatley, there is an issue with the machine that I$\text{'}$m dealing with. Requirement three is that the coin input will stop once $75$ cents is reached but this is not working so customers can continue depositing coins into the machine. How do I correct this issue?