Assuming none pushed to origin.
git rebase -i HEAD~n where n is number of recent commits to squash.
Vim will show commits from oldest to newest.
- i to enter interactive mode.
- make changes. Esc to leave interactive mode
- :w to write
- : x to execute (remove space between : x. Preventing emoji render)
PICK the oldest (first line). SQUASH the subsequent commits.
Do a similar thing with Vim to edit the new commit message (interact, save, execute)