Architecture Design Interview Question:

Assume a building having three floor and a lift,
the lift has the following buttons:

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a. G (for ground floor)
b. 1 (for first floor)
c. 2 (for the second floor)
d. 3 (for the 3rd floor)
e. Stop (Stop button to stop the lift in emergency)

Assume currently the lift is in the ground floor; write an algorithm for the lift to work.
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