Elevator Control Function

elevator.js

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Elevator version 1 features:

1. Elevator can move to and from any floor between 'B' (basement) and floor 100. Floor 'B' is the lowest floor next to the 1st floor. Floor 'G' (ground) is equivalent to the 1st floor.
2. Maximum weight is 2500. If input weight is greater than the maximum, Elevator will not travel, and will signal "Overload".
3. For version 1, elevator always resets to 1st floor after each completed operation.