[REFACTOR] test code de-duplication. Generic added.

Author: Gonzalo Diaz

algorithm-exercises-csharp-test/src/hackerrank/interview_preparation_kit/linked_list/LinkedListCycle.Test.cs

@@ -6,7 +6,7 @@ public class LinkedListCycleTest
   class LinkedListCycleTestCase
   {
     public string title = "";
-    public LinkedList<int>.Node? llist;
+    public LinkedList<string>.Node? llist;
     public bool expected;
   }
 
@@ -28,9 +28,9 @@ public void testInitialize()
     ll1_4.next = ll1_5;
     ll1_4.next = ll1_3; // <- cycle
 
-    LinkedList<int>.Node ll2_1 = new(1);
-    LinkedList<int>.Node ll2_2 = new(2);
-    LinkedList<int>.Node ll2_3 = new(3);
+    LinkedList<string>.Node ll2_1 = new("a");
+    LinkedList<string>.Node ll2_2 = new("b");
+    LinkedList<string>.Node ll2_3 = new("c");
 
     ll2_1.next = ll2_2;
     ll2_2.next = ll2_3;

algorithm-exercises-csharp/src/hackerrank/interview_preparation_kit/linked_list/LinkedListCycle.cs

@@ -9,11 +9,11 @@ public class LinkedListCycle
   [ExcludeFromCodeCoverage]
   protected LinkedListCycle() { }
 
-  public static bool hasCycle(LinkedList<int>.Node? head)
+  public static bool hasCycle<T>(LinkedList<T>.Node? head)
   {
-    List<LinkedList<int>.Node> llindex = [];
+    List<LinkedList<T>.Node> llindex = [];
 
-    LinkedList<int>.Node? node = head;
+    LinkedList<T>.Node? node = head;
 
     while (node != null)
     {