Comments.scala

object Comments extends App {

  var before = "";
  var count = 0

  var result = "";

  for (c <- Source.in2) {

    if (count == 0) {
      result += (c + "")
    } 

    (before + c) match {
      case "/*" =>
        count += 1
        if (1 == count) result = result.init.init
        before = ""
      case "*/" if count > 0 =>
        count -= 1
        before = ""
      case _ =>
        before = c.toString
    }
    
  }

  println("Case #1:\n" + result)
}