def move(): Unit = {
    val someSnake = game.players.find(p => p.snake.headColor != headColor)

    if (someSnake.isDefined) {
      val nbr_snake = someSnake.get.snake

      if (isHeadCollision(nbr_snake)) {
        dir match {
          case North | South => dir = East; nbr_snake.dir = West
          case East | West => dir = North; nbr_snake.dir = South
          case _ =>
        }
      }

      if (isTailCollision(nbr_snake)) game.enterGameOverState()

    }
    if (!isOccupyingBlockAt(body.head + dir)) (body.head + dir) +=: body else game.enterGameOverState()

    if (body.size > initTailSize) body -= body.last


  } // väx och krymp enl. regler; action om äter frukt