Count the number of occurrences of "OXO" in rows, columns, diagonals and anti-diagonals.
Example:
>> board = ['OOX'
'XXO'
'OXO'];
>> count_OXO(board)
ans =
3
>> board = [' O '
'XXO'
'OXO'];
>> count_OXO(board)
ans =
1
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