// Game is ran, goes a round as long as there is a free space and no winner yet.
  public static void playGame(TicTacToe game) {
    System.out.println("Let the games begin!");
    while (game.isAnyFreeSpotLeft()
        && !game.isWinner(STATE.CIRCLE)
        && !game.isWinner(STATE.CROSS)) {

      moveplayer("cross", game);
      game.isThreeInRow(STATE.CROSS);
      if (!game.isWinner(STATE.CROSS)) {
        moveplayer("circle", game);
        game.isThreeInRow(STATE.CIRCLE);
      } else {
        System.out.println("The player with the CROSS is the winner!");
      }
    }
    if (game.isWinner(STATE.CIRCLE)) {
      System.out.println("The player with the CIRCLE is the winner!");
    }
  }