fix bug in enumerator should sort

Author: justcoding121

src/Advanced.Algorithms/DataStructures/Tree/AvlTree.cs

@@ -596,11 +596,6 @@ IEnumerator IEnumerable.GetEnumerator()
 
         public IEnumerator<T> GetEnumerator()
         {
-            if (nodeLookUp != null)
-            {
-                return new BSTNodeLookUpEnumerator<T>(nodeLookUp);
-            }
-
             return new BSTEnumerator<T>(Root);
         }
     }

src/Advanced.Algorithms/DataStructures/Tree/RedBlackTree.cs

@@ -755,11 +755,6 @@ IEnumerator IEnumerable.GetEnumerator()
 
         public IEnumerator<T> GetEnumerator()
         {
-            if (nodeLookUp != null)
-            {
-                return new BSTNodeLookUpEnumerator<T>(nodeLookUp);
-            }
-
             return new BSTEnumerator<T>(Root);
         }
     }

src/Advanced.Algorithms/DataStructures/Tree/Shared/BSTEnumerator.cs

@@ -59,53 +59,4 @@ public void Dispose()
         }
     }
 
-    //  implement IEnumerator.
-    internal class BSTNodeLookUpEnumerator<T> : IEnumerator<T> where T : IComparable
-    {
-        private readonly Dictionary<T, BSTNodeBase<T>> nodeLookUp;
-        private Dictionary<T, BSTNodeBase<T>>.Enumerator enumerator;
-        private T current;
-
-        internal BSTNodeLookUpEnumerator(Dictionary<T, BSTNodeBase<T>> nodeLookUp)
-        {
-            this.nodeLookUp = nodeLookUp;
-            enumerator = nodeLookUp.GetEnumerator();
-        }
-
-        public bool MoveNext()
-        {
-            if (nodeLookUp == null)
-            {
-                return false;
-            }
-
-            if (enumerator.MoveNext())
-            {
-                current = enumerator.Current.Key;
-                return true;
-            }
-
-            return false;
-        }
-
-        public void Reset()
-        {
-            enumerator = nodeLookUp.GetEnumerator();
-        }
-
-        public T Current
-        {
-            get
-            {
-                return current;
-            }
-        }
-
-        object IEnumerator.Current => Current;
-
-        public void Dispose()
-        {
-            enumerator.Dispose();
-        }
-    }
 }