Write a program called mystring.cpp. The program should has several functions: 1. string lower (string word) /l e.g. Hello => hello 2. string upper (string word) Il e.g. hello => HELLO 3. string capitalize (string word)// e.g. hello => Hello 4. string reverse (string word) Il e.g. hello => olleH 5. These functions return a string as indicated in the examples above from the word it gets as an argument. The program should loop until the user enters "quit".

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