added fixes after review

src/main/java/mate/academy/service/AuthenticationService.java

@@ -16,12 +16,7 @@ public class AuthenticationService {
     private final UserService userService = new UserService();
 
     public boolean login(String email, String password) {
-
         User user = userService.findByEmail(email);
-
-        if (user == null) {
-            return false;
-        }
-        return user.getEmail().equals(email) && user.getPassword().equals(password);
+        return user != null && user.getEmail().equals(email) && user.getPassword().equals(password);
     }
 }

src/main/java/mate/academy/service/UserService.java

@@ -3,7 +3,7 @@
 import mate.academy.model.User;
 
 public class UserService {
-    private static final User[] users = new User[]{
+    private static final User[] users = new User[] {
             new User("[email protected]", "1234"),
             new User("[email protected]", "1234")};