findWinner.scala

def findWinner(candidates: Seq[String], rotations: Int): Option[String] = {
    if (candidates.isEmpty || rotations <= 0) None
    else {
        val numCandidates =  candidates.length
        val randomIndexes = List.fill(rotations)(scala.util.Random.nextInt(numCandidates))
        val meanOp = randomIndexes.drop(rotations / 2).headOption
        meanOp.map(candidates(_))
    }
}