-- header-only, platform-agnostic implementation of getopt, getopt_long, and getopt_long_only released into the public domain.

- Author: Murilo Reis <github.com/ottavm/getopt>
- License: Public Domain

- Notes
    1. This implementation does not depend on any libc or OS- specific functions.

    1. This implementation does not handle errors. The programmer must handle errors manually.

    3. This implementation will likely behave just like the well-known standard getopt implementations, with one exception:

    4. If getopt_long or getopt_long_only encounters an ambiguous or invalid option, it returns '?', and sets optarg to that specific option.

-- Examples: src/main.c