Use Git!
You can use git, with "remote repository". With git you can work online with your team. The manager of the project can edit everything. Also the manager of the project will have to approve all the changes that the team will do.
I use git all the time with my team. It's easy to use. In my opinion is the best for the use of a team work project.
Nick-S-Dev
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can you show us your code??
so we can help.