makeFigure.scala

def makeFigure(size: Int, spaces: Int, characters: Int, spacesModifier: Int, charactersModifier: Int): String = {
  val charsValsStream = Stream.iterate(characters, size)(chars => chars + charactersModifier)
  val spacesValsStream = Stream.iterate(spaces, size)(spaces => spaces + spacesModifier)
  (charsValsStream zip spacesValsStream).foldLeft(new StringBuilder) { case (builder,(characters,spaces)) =>
    builder append (" " * spaces) append ("*" * characters) append "%n".format()
  }.toString()
}