private string GetFieldCode(Sudoku sudoku, int[] coordinate)
{
var coordinateString = $"{coordinate[0]}.{coordinate[1]}";
var visibleNumber = sudoku.GetIntegerOfIncompleteArray(coordinate);
if (visibleNumber == 0)
{
visibleNumber = sudoku.GetIntegerOfFilledInArray(coordinate);
}
var solutionNumber = sudoku.GetIntegerOfCompleteArray(coordinate);
string isReadOnlyString = DetermineIfFieldIsReadOnly(sudoku, coordinate).ToString();
var boxID = sudoku.GetBoxNumberOfCoordinate(coordinate);
return($"{coordinateString},{visibleNumber},{solutionNumber},{isReadOnlyString},{boxID}");
}