A 2D matrix is declared and initialized with zeros, as any player turns, the corresponding 1 or 2 is written in the matrix.
After each turn the matrix is checked in function "whowins.m", with any number (1 or 2) coming three in line, that number is returned other wise '0', if -1 is returned it means its a draw.

winning logic simply checks all possible options a player can win and the corresponding function is called after each turn.
The 2D array is updated each turn and whowins.m is checking that for all three cases (player 1 wins, player 2 wins and Draw)