libutility

This is utility library, something like STL with enhanced extension

Now is public domain, maybe change license to LGPLv2 if needed.
This project will split into two project libutility and libutilitysstdc++

libutilitysstdc++ (the std part of libutility, include the stardand C library)

will have many implement defined interfaces and some light-weight extensions. in fact, some library TS is hard to support(such as parallel TS(many function to merge into cpp17, but no compiler support. <_<), and concept TS(will support when compiler support cpp20)), I will try it.

libutility (extensions for libutilitysstdc++ and some useful tools)

main development of the library

string_builder support: sync string build class (not a string, without some access functions)
generate langange parser: use a mark language(see railway diagrams) to analyze all language(or just analyze the setting file the library used.)
soucre_location(as a library TS2 class, which needs compiler support heavily...)
Compression support
crypto support
enhanced support for cstdlib, cctypes(such as is_num) and other original C library (not include i/o function, will optimize at sstdc++ for safe and extend resons, please search to get answer)
posix interface support(I think it should be in the sstdc++?)
and something I forget...