Small modifications

Author: LimZiJia

frontend/src/_environments/environment.ts

@@ -1,7 +1,6 @@
 import { Injectable } from '@angular/core';
 import { HttpRequest, HttpHandler, HttpEvent, HttpInterceptor } from '@angular/common/http';
 import { Observable } from 'rxjs';
-
 import { AuthenticationService } from '../_services/authentication.service';
 
 @Injectable()