Git amend can add stuff to a previous commit. It's quite handy if you, for example, fix some url's in a test file, commit and then notice you had similar stuff that should've been in the same commit.
To add more stuff to a previous commit you only need to amend it:
git commit --amend
Keep or modify the commit msg and you're all set! This is completely safe if you haven't pushed the commit to remote.
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