public class TicTacToe

$\{$

$/**$

$*$ Return true if all elements on the diagonal joining the upper$-$left

$*$ and the lower$-$right corners all the same.

$*$ @param board a $3$ x $3$ array of String

$*$ @return true if all elements are the same.

$*/$

public static boolean checkUpperLeftToLowerRight$($String$[][]$ board$)$

$\{$

$/*$ Your code goes here $*/$

$\}$

$\}$