STYLE: Move three internal helper functions into the unnamed namespace #165

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Treating doxygen as a formula. For the cask, use homebrew/cask/doxygen or specify the `--cask` flag.

zstd 1.5.6 is already installed and up-to-date. To reinstall 1.5.6, run: brew reinstall zstd

aria2 1.37.0 is already installed and up-to-date. To reinstall 1.37.0, run: brew reinstall aria2

gnu-tar 1.35 is already installed and up-to-date. To reinstall 1.35, run: brew reinstall gnu-tar

Treating cmake as a formula. For the cask, use homebrew/cask/cmake or specify the `--cask` flag.