fix

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

@@ -1,5 +1,7 @@
 package mate.academy.service;
 
+import mate.academy.model.User;
+
 public class AuthenticationService {
     private static final UserService userService = new UserService();
     /**
@@ -13,7 +15,8 @@ public class AuthenticationService {
      */
 
     public boolean login(String email, String password) {
-        return userService.findByEmail(email) != null
-                && userService.findByEmail(email).getPassword().equals(password);
+        User user = userService.findByEmail(email);
+        return user != null
+                && user.getPassword().equals(password);
     }
 }