code: public void unshareProject(Object projectIdOrPath, Integer groupId) throws GitLabApiException {
          Response.Status expectedStatus = (isApiVersion(ApiVersion.V3) ? Response.Status.OK : Response.Status.NO_CONTENT);
          delete(expectedStatus, null, "projects", getProjectIdOrPath(projectIdOrPath), "share", groupId);
      }
docs: Unshare the project from the group.
  
  <pre><code>DELETE /projects/:id/share/:group_id</code></pre>
  
  @param projectIdOrPath projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance, required
  @param groupId the ID of the group to unshare, required
  @throws GitLabApiException if any exception occurs