code: def unshare_project(project_id, usernames,**kwargs):
      
  
      user_id = kwargs.get('user_id')
      proj_i = _get_project(project_id)
      proj_i.check_share_permission(user_id)
  
      for username in usernames:
          user_i = _get_user(username)
          #Set the owner ship on the network itself
          proj_i.unset_owner(user_i.id, write=write, share=share)
      db.DBSession.flush()
docs: Un-share a project with a list of users, identified by their usernames.