ref: 3c3468355f8cf3dd644058ab239b948f8facebfa
parent: d7b931824b452a6b70a599c69f4f1843f1b2daa5
author: Ben Harris <bjh21@bjh21.me.uk>
date: Sat Feb 18 18:07:44 EST 2023
Use unreserved macro names for multiple-include protection Some headers used macros named like _THING_H for multiple-include protection. That style of name is reserved in ISO C, though, so I've replaced it with PUZZLES_THING_H which is my favourite of the other styles in use.