void draw(void)
{
    int count = 0;
    for (int i = 0; i < d; i++) {
        for (int j = 0; j < d; j++) {
            if (board[i][j] == 0) {
                printf(" _ ");
                count++;
            }
            else {
            if (board[i][j] < 10) {
                printf(" %i ", board[i][j]);
                    count++;
            }
            else {
            printf("%i ", board[i][j]);
            count++;
            }
            if (count % d == 0) {
                printf("\n\n");


            }
            }
        }
    }
    printf("\n");
}

/**
 * If tile borders empty space, moves tile and returns true, else
 * returns false.
 */
/*bool move(int tile)
{
    for (int i = 0; i <= d-1; i++) {
        for (int j = 0; j <= d-1; j++) {
            if (board[i][j] == tile) {
                int tile = board[i][j];
                if (tile == board[blank_col][blank_row-1]) {
                    int temp = board[i][j];
                    board[i][j] = board[blank_col][blank_row];
                    board[blank_col][blank_row] = temp;
                }
            }
        }
    }
    return true;
}*/

bool move(int tile)
{
    for (int row = 0; row <= d-1; row++) {
        for (int column = 0; column <= d-1; column++) {
            if (board[row][column] == 0)
            {
                if (board[row-1][column] == tile) // valid move swap with up
                {
                    board[row][column] = tile;
                    board[row-1][column] = 0;
                    return true;
                } else if (board[row+1][column] == tile) // valid move swap with down
                {
                    board[row][column] = tile;
                    board[row+1][column] = 0;
                    return true;
                } else if (board[row][column-1] == tile) // valid move swap with left
                {
                    board[row][column] = tile;
                    board[row][column-1] = 0;
                    return true;
                } else if (board[row][column+1] == tile) // valid move swap with right
                {
                    board[row][column] = tile;
                    board[row][column+1] = 0;
                    return true;
                }

            }
        }
    }
    return true;
}