Function allowing you to find duplicate in an array in linear time and constant space

Overview

Floyd's tortoise and hare

Function allowing you to find duplicate in an array in linear time and constant space !

Floyd's method is a pretty amazing, allowing you to find a duplicate number. Given an array : "array" (of size n) containing n+1 integers, where each integer is beetween 1 and n (inclusive).
One duplicate number MUST exist (simple logic) : FIND IT.

Got the idea from this video !

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