Question: im working with a TI launchpad, help me out with this question please! no line numbers Develop an app for which user types character to

im working with a TI launchpad, help me out with this question please! no line numbers
Develop an app for which user types character to a serial terminal and vending machine.
This vending machine is a state machine State S0: Accepting Purchase and, State S1: Payment Transaction.
In State S0 the machine transmits the character W (Welcome). The machine accepts a selection of two items A or B. User selects the item by typing a character, the machine only transmits the valid characters A or B in response to the selection, or else does nothing.
After the user selects the machine transitions to State S1. The user tap the payment by typing P, and the machine transmits P or any character to cancel. The machine goes to accepting purchase state.

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