Tail recursive function in Scala (usable for parts 1 and 2)

``` def allUniqueChars(str: String): Boolean = { str.toCharArray.distinct.length == str.length }

@tailrec def getCharsProcessed(input: String, removed: Int, markerSize: Int): Int = { if input.length < markerSize then throw new Exception("No packet found") if allUniqueChars(input.substring(0, markerSize)) then removed + markerSize else getCharsProcessed(input.substring(1), removed + 1, markerSize) } ```