bugfix: fix memory leak issue

17.IteratorPattern/2.Code/Iterator.h

@@ -12,6 +12,7 @@ class Iterator
 {
 public:
 	Iterator(){}
+	virtual ~Iterator(){}
 	// 声明抽象遍历方法
 	virtual void first() = 0;
 	virtual void last() = 0;

17.IteratorPattern/2.Code/main.cpp

@@ -33,6 +33,7 @@ int main()
 	system("pause");
 
 	delete tv;
+	delete remoteControl;
 	
 	return 0;
 }