private static Board CreateInputBoard(string filePath)
{
var boardData = new int[9][];
using var reader = File.OpenText(filePath);
for (var i = 0; i < 9; i++)
{
string line;
do
{
line = reader.ReadLine();
} while (!line?.Contains(",") ?? false);
var numbers = line.Split(",")
.Select(s => int.TryParse(s, out var value) ? value : NumberEx.Unknown)
.ToArray();
if (numbers.Length != 9)
{
throw new ArgumentException("Invalid data format");
}
boardData[i] = numbers;
}
return(Board.CreateInitialBoard(boardData));
}