Add more string searching functions, add unit tests #64

	name: Spell Check
	on: [push]

	jobs:
	check-unix:
	runs-on: ubuntu-latest
	name: Check Spelling

	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Install codespell
	run: \|
	pip install codespell
	- name: Run codespell
	run: \|
	codespell src/ *.md -L berkley
	rc=$?
	if [ $rc != 0 ]; then
	cat <<EOF

	=================================== ERROR ===================================
	Spell check failed, please correct the spelling mistakes at the locations
	listed above. If any of the reported mistakes are false positives, please add
	the lines provoking them to misc/suppressions/codespell-lines file or, if
	there are many occurrences of the same word, add this word to codespell-words
	file in the same directory.
	EOF
	>& 2
	exit $rc
	fi

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