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Given a multi-dimensional array representing a board in Sudoku, the function should be able to return whether the sudoku is valid or not.
Examples:
var goodSudoku = new Sudoku([
[7,8,4, 1,5,9, 3,2,6],
[5,3,9, 6,7,2, 8,4,1],
[6,1,2, 4,3,8, 7,5,9],
[9,2,8, 7,1,5, 4,6,3],
[3,5,7, 8,4,6,...