Exotic filesystem, input and output library for C,
- get working directory
- function to get absolute path
- function to get relative path
- hand rolled custom function to get absolute path
- hand rolled custom function function to get relative path
- write the fio_path to resolve name, extension, like C++ filesystem::path
- write the lazy fio_path to resolve name, extension only when required, use lazy flag in fio_path_s struct