static bool AccessibleCell(Cell cell)
        {
            long rows = Matrix.GetLongLength(0);
            long cols = Matrix.GetLongLength(1);
            int row = cell.X;
            int col = cell.Y;

            if (row < 0 || row >= rows ||col < 0 || col >= cols ||Matrix[row, col] != "0")
            {
                return false;
            }
            return true;
        }
 static void VisitCell(Cell cell)
 {
     if (AccessibleCell(cell))
     {
         VisitedCells.Enqueue(cell);
         Matrix[cell.X, cell.Y] = cell.Value.ToString();
     }
 }