Description: define InternetURL class to save a URL string like as www.bit.edu.cn ，and realize the demands as follows:
0. You CAN NOT use string in the program
1. You must use MyString you just defined in the exercise3.txt to save URL string；
2. Get domain name URL. For example, we can get www.bit.edu.cn www.bit.edu.cn/jwc/080329.html ；
3. Get top domain name URL. For example, we can get .cn www.bit.edu.cn/jwc/080329.html ；
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44.cpp
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