Add `commonPrefix(with:)`, `commonSuffix(with:)`#153

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timvermeulen wants to merge 7 commits intoapple:mainfrom

timvermeulen:common-prefix

Commits on Jul 23, 2021

Add commonPrefix(with:), commonSuffix(with:)
Tim Vermeulen
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Commits on Aug 4, 2021

Rename `endsOfCommonPrefix` -> `endOfCommonPrefix`, `startsOfCommonSuffix` -> `startOfCommonSuffix`
Tim Vermeulen
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Add documentation
Tim Vermeulen
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Ensure `CommonPrefix.Iterator` keeps returning `nil` after it has done so once
Tim Vermeulen
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Commits on Aug 5, 2021

Add the guide
Tim Vermeulen
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Add missing tests
Tim Vermeulen
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Finishing touches
Tim Vermeulen
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