Quick sort is implemented using mutable array

The quick sort implemented in the folder Scala-Way is using a mutable array. Can/Should this be done in an immutable way?

Start by locating the quick sort implementation in the Scala-Way folder and reading how it currently uses a mutable array. Determine whether an immutable implementation fits the project’s functional approach; done means the issue’s question is resolved with quick sort no longer relying on a mutable array.

Written by the indexing model from the issue text.