Lab 5: Permutation using Recursion solution

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Introduction
In mathematics, the notion of permutation relates to the act of rearranging, or permuting, all
the members of a list into some sequence or order. For example, there are six permutations of the
list [1,2,3], namely: [1,2,3], [1,3,2], [2,1,3], [2,3,1], [3,1,2], and [3,2,1]. The number
of permutations of n distinct objects is n factorial (n!).
What to do
Implement the recursive method named permutation (marked TO DO) which can be found in
Permutation.java. This method takes an ArrayList