The real question is, why do you still have the code at all if you're no longer at that job? Delete the project.
If you're asking about a different project that is not related to your former employer, then you should only get those symbols if you've cloned another repository and made changes to it. How to discard your changes depends on what versioning tool the repository is using. If you're using Git, you can easily discard all changes by running the following line from the command prompt:
git reset tells Git to move the currently checked out branch to the specified commit. HEAD refers to the commit you're currently making changes to. So normally, git reset HEAD doesn't really do that much, because it just moves the currently checked out branch to the commit that it's already on. However, the --hard option tells Git to also throw away all changes in your working directory that have been made since the last commit to HEAD.
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