Challenge 13 - Product of everything else
Create a function that takes in an array of integers and replaces each number in the array with the product of all the numbers in the array except the number at that index itself.
For example, `fn([1, 2, 3, 4, 5])` should return `[120, 60, 40, 30, 24]` and `fn([5, 5, 5])` should return `[25, 25, 25]`.
Input:
Output