refactor code

src/main/webapp/app/exercise/exercise-details/exercise-details.component.ts

@@ -2,6 +2,7 @@ import { HttpResponse } from '@angular/common/http';
 import { Component, EventEmitter, Input, OnDestroy, OnInit, Output } from '@angular/core';
 import { Router } from '@angular/router';
 import { faFolder } from '@fortawesome/free-solid-svg-icons';
+import { ReviewManagementService } from 'app/admin/review-management/review-management.service';
 import { ApplicationInfoService } from 'app/core/application/applicationInfo.service';
 import { Account } from 'app/core/auth/account.model';
 import { AccountService } from 'app/core/auth/account.service';
@@ -98,6 +99,7 @@ export class ExerciseBodyComponent implements OnInit, OnDestroy {
   oerExerciseMatch = /([a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12})$/;
 
   constructor(
+    private reviewManagementService: ReviewManagementService,
     private accountService: AccountService,
     protected pluginService: PluginService,
     private searchService: SearchService,
@@ -171,13 +173,7 @@ export class ExerciseBodyComponent implements OnInit, OnDestroy {
   }
 
   getGitLabUrl(): string {
-    const lastSlashPos = this.exercise?.file.path.lastIndexOf('/');
-    if (!lastSlashPos || lastSlashPos <= 0) {
-      return this.exercise!.project.url;
-    }
-    const prefix = this.exercise!.file.path.substring(0, lastSlashPos);
-    const branch = 'main';
-    return `${this.exercise!.project.url}/-/tree/${branch}/${prefix}`;
+    return this.reviewManagementService.getGitLabUrl(this.exercise!);
   }
 
   openLink(link: string): void {