int check_winner(char board[3][3], char player) {
    // Горизонтали
    for (int i = 0; i < 3; i++) {
        if (board[i][0] == player && board[i][1] == player && board[i][2] == player)
            return 1;
    }
    // Вертикали
    for (int j = 0; j < 3; j++) {
        if (board[0][j] == player && board[1][j] == player && board[2][j] == player)
            return 1;
    }
    // Диагонали
    if (board[0][0] == player && board[1][1] == player && board[2][2] == player)
        return 1;
    if (board[0][2] == player && board[1][1] == player && board[2][0] == player)
        return 1;

    return 0;
}