The Elevator's Day

The elevator's odometer counts every floor it passes, up or down. 🛗

It starts at floor 0 and visits each floor in the requests list, in order. Print the total floors traveled.

Example:

Input: requests = [3, 1, 5] Output: 9

From 0 to 3 is 3 floors, 3 to 1 is 2 floors, 1 to 5 is 4 floors — the odometer totals 3 + 2 + 4 = 9.