Finished

Numbers/NumberFactory/NumbersEnumerator.cs

@@ -14,26 +14,44 @@ public sealed class NumbersEnumerator : IEnumerator<long>
     /// <param name="list">List to iterate over</param>
     public NumbersEnumerator(List<long> list)
     {
-        // TODO
-        List = null!;
+        List = list;
+        Index = -1;
     }
 
     private int Index { get; set; }
     private List<long> List { get; }
 
-    public long Current => -1L; // TODO
-
-    public void Dispose() 
+    public long Current
     {
-        // TODO?
+        get
+        {
+            if (Index < 0 || Index >= List.Count)
+            {
+                return -1;
+            }
+            
+            return List[Index];
+        }
     }
 
-    object IEnumerator.Current => null!; // TODO
+    public void Dispose() { }
 
-    public bool MoveNext() => false; // TODO
+    object IEnumerator.Current => Current;
+
+    public bool MoveNext()
+    {
+        if (Index >= List.Count - 1)
+        {
+            return false;
+        }
+
+        Index++;
+        return true;
+
+    }
 
     public void Reset()
     {
-        // TODO
+        Index = -1;
     }
 }