Need help with writing a program in C.

You will use BTN3 as a reset button which will refund all money entered and reset the state to 0 if the system is not already in the zero state. When the reset is pressed, your program should flash LED1, LED2, and LED3 momentarily before they all return to the unlit condition. You will use BTN3 as a reset button which will refund all money entered and reset the state to 0 if the system is not already in the zero state. When the reset is pressed, your program should flash LED1, LED2, and LED3 momentarily before they all return to the unlit condition