c++ core guide and google style guid

https://www.youtube.com/watch?v=UONLB7wBVSc&ab_channel=CppCon

https://github.com/lynnboy/CppCoreGuidelines-zh-CN/blob/master/CppCoreGuidelines-zh-CN.md

https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines