https://stackoverflow.com/questions/179123/how-to-modify-existing-unpushed-commits
Amending the most recent commit message
git commit --amendwill open your editor, allowing you to change the commit message of the most recent commit. Additionally, you can set the commit message directly in the command line with:
git commit --amend -m "New commit message"…however, this can make multi-line commit messages or small corrections more cumbersome to enter.
Make sure you don't have any working copy changes staged before doing this or they will get committed too. (Unstaged changes will not get committed.)
Changing the message of a commit that you've already pushed to your remote branch
If you've already pushed your commit up to your remote branch, then you'll need to force push the commit with
git push <remote><branch>--force
# Or
git push <remote><branch>-fWarning: force-pushing will overwrite the remote branch with the state of your local one. If there are commits on the remote branch that you don't have in your local branch, you will lose those commits.
Warning: be cautious about amending commits that you have already shared with other people. Amending commits essentially rewrites them to have different SHA IDs, which poses a problem if other people have copies of the old commit that you've rewritten. Anyone who has a copy of the old commit will need to synchronize their work with your newly re-written commit, which can sometimes be difficult, so make sure you coordinate with others when attempting to rewrite shared commit history, or just avoid rewriting shared commits altogether.
Use interactive rebase
Another option is to use interactive rebase.
This allows you to edit any message you want to update even if it's not the latest message.
In order to do a git squash, follow these steps:
// X is the number of commits to the last commit you want to be able to edit
git rebase -i HEAD~X
Once you squash your commits - choose the e/r for editing the message