C program to continuously display the course number 'INTERFACING' centred on the top line of the LCD. Only display it once, do not keep updating the first line or it will flicker.

Centred on the second line of the LCD, display a counter that counts from down from 99 to 0, with a second delay, in between each number displayed. Once the count reaches 0, it should roll-over and start counting down from 99. Use the on-board button to stop and start the count (button down starts the count).