added two more questions:

- unique character in string
- atio
added 4 more questions
added Crack the Code interview question
added CCI questions
I guess it kind of make sense, not to use golang as programming language. They want c++ programmer. I guess from this point need to learn modern C++ and enhance the stuff they teach in school!
added reference and other good information
more question and and interview questions
added the must know ADT and other stuff