Bash-style variable substitution C library and tool.
Build and enter development environment:
# host system
$ task dev
# docker container
root@vsub:/build$ task compile # compile and execute 🚀
root@vsub:/build$ vsub --help
root@vsub:/build$ task test # run tests 🔥
root@vsub:/build$ task debug # debug 🚑
# host system
$ task research