Hint fixed

Hint now doesn't get stuck with sudoku and binary

PuzzlePlayer/Board.cs

@@ -6,6 +6,8 @@ using System.Reflection.Metadata;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
+using System.Diagnostics;
+using static System.Windows.Forms.VisualStyles.VisualStyleElement.Rebar;
 
 namespace PuzzlePlayer_Namespace
 {
@@ -102,7 +104,8 @@ namespace PuzzlePlayer_Namespace
         }
 
         // virtual method for solving one step
-        public virtual void Hint()
+
+        /*public virtual void Hint()
         {
             int row;
             int col;
@@ -131,6 +134,35 @@ namespace PuzzlePlayer_Namespace
                 }
             }
         }
+        */
+
+        public virtual void Hint()
+        {
+            List<Tuple<int, int>> emptySpaces = new List<Tuple<int, int>>();
+
+            for (int x = 0; x < boardState.GetLength(0); x++)
+            {
+                for (int y = 0; y < boardState.GetLength(1); y++)
+                {
+                    if (boardState[x, y] == emptySpace)
+                    {
+                        emptySpaces.Add(new Tuple<int, int>(x, y));
+                    }
+                }
+            }
+
+            if (emptySpaces.Count > 0)
+            {
+                int index = random.Next(emptySpaces.Count);
+
+                Tuple<int, int> randomEmptySpace = emptySpaces[index];
+
+                int row = randomEmptySpace.Item1;
+                int col = randomEmptySpace.Item2;
+
+                boardState[row, col] = solution[row, col];
+            }
+        }
 
         public virtual int RandomNumber(int number)
         {