Git correct a commit via --fixup

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Git correct a commit via --fixup

Initial commit state:

$ git log --oneline
733e2ff Second widget done
fb2f677 First widget done
ac5db87 First commit

But... turns out we have an error in fb2f677 First widget done. Lets fix it, then commit:

git commit --fixup fb2f677

Now list git log:

$ git log --oneline
c5069d5 fixup! First widget done
733e2ff Second widget done
fb2f677 First widget done
ac5db87 First commit

And finally merge c5069d5 into fb2f677:

$ git rebase --autosquash --interactive ac5db87