Code/cplusplus/geminitutorial/tutorial2/tutorial-2.2-followup.md

Take Aways:

1. std::string_view: manipulation of strings without the costs of ownership: i. copying and storing large string objects implemented as an type storing the first element and lenght of string see link

2. Explain sync pattern or idiom in relation to string_view

3. clang-tidy static checking -how does it work?