changed function for shifting cells and marks. now allows for wrap around - next up is incorporating logic to delete or clear cells that get wrapped around

Gameplay/Globals.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using Godot;
 
 public static partial class Globals
 {
@@ -7,15 +8,29 @@ public static partial class Globals
     public static Random _rng = new();
     public static List<string> _addressTranslation = new(){"NW","N","NE","W","C","E","SW","S","SE"};
 
-    public static void Shuffle<T>(this IList<T> list)
+    public static List<T> ShiftList<T>(List<T> LIST, int SHIFT_BY)
     {
-        int n = list.Count;
+        if (LIST.Count <= SHIFT_BY || LIST.Count == 0 || SHIFT_BY ==0)
+        {
+            return LIST;
+        }
+        int getRangeStart = SHIFT_BY < 0 ? -SHIFT_BY : LIST.Count - SHIFT_BY;
+        int getRangeEnd = SHIFT_BY < 0 ? LIST.Count + SHIFT_BY : SHIFT_BY;
+        int addRangeEnd = SHIFT_BY < 0 ? -SHIFT_BY : LIST.Count - SHIFT_BY;
+        var result = LIST.GetRange(getRangeStart, getRangeEnd);
+        result.AddRange(LIST.GetRange(0, addRangeEnd));
+        return result;
+    }
+
+    public static void Shuffle<T>(IList<T> LIST)
+    {
+        int n = LIST.Count;
         while (n > 1) {
             n--;
             int k = _rng.Next(n + 1);
-            T value = list[k];
-            list[k] = list[n];
-            list[n] = value;
+            T value = LIST[k];
+            LIST[k] = LIST[n];
+            LIST[n] = value;
         }
     }