I have committed a piece of code as commit1 but after finishing it, I want to remove the commit1 and commit the entire code as Initial Commit.
When I run git reset HEAD~ in Git Bash, it results in deleting all my code.
Is it possible to delete commit1 instead of everything, and how?
Yes. You can for example run:
git rebase --interactive --root And then change the action before the commit you want to squash to f (it stands for fixup = squash the commit to the previous one and discard the commit message). Then simply save and close the file (using :wq if it opened the default Vim editor).