Tic-Tac-Toe Winner

HARD2D Arrays12 marks

Read a 3 by 3 board and output the winner.

Each input row contains three characters. X and O are player marks, and - is an empty square. Output X or O if that player has a complete row, column, or diagonal. Otherwise output Draw.

Input: Three strings, each with three characters. Output: X, O, or Draw.

Example:

Input:  XO-
        OX-
        --X
Output: X

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Sample Test Cases

Test 1: Main diagonal win

Inputs: XO-, OX-, --X

Expected: X

Test 2: Row win

Inputs: OOO, XX-, ---

Expected: O

Test 3: No winning line

Inputs: XOX, OXO, OXO

Expected: Draw