isTopStart
Checks if the box is in the top-left corner of the Sudoku grid.
Return
true if the box is in the top-left corner; otherwise, false.
Parameters
dimension
The dimension of the Sudoku grid.
Checks if the cell is in the top-start corner of the Sudoku grid.
Return
true if the cell is in the top-start corner; otherwise, false.
Parameters
dimension
The dimension of the Sudoku grid.