chore: fix README

Author: drupol

README.md

@@ -94,7 +94,7 @@ TIN::fromSlug('be7110.2512345')->check(); // Not strict
 TIN::fromSlug('be7110.2512345')->check(strict: false); // Not strict
 TIN::fromSlug('be7110.2512345')->check(true); // Strict
 TIN::fromSlug('be7110.2512345')->check(strict: true); // Strict
-
+```
 
 ## Installation
 
@@ -145,4 +145,3 @@ Support our contributors by sponsoring them on [Github][github sponsors link].
   https://img.shields.io/github/actions/workflow/status/loophp/tin/tests.yml?branch=master&style=flat-square
 [github sponsors link]: https://github.com/loophp/tin/graphs/contributors
 [github actions link]: https://github.com/loophp/tin/actions
-```

src/CountryHandler/Slovakia.php

@@ -44,11 +44,12 @@ public function hasValidRule(string $tin): bool
     protected function hasValidLength(string $tin): bool
     {
         $c1c2 = substr($tin, 0, 2);
+        $hasValidLength = parent::hasValidLength($tin);
 
         if (54 > $c1c2) {
-            return $this->matchLength($tin, self::LENGTH) || $this->matchLength($tin, self::LENGTH - 1);
+            return $hasValidLength || $this->matchLength($tin, self::LENGTH - 1);
         }
 
-        return parent::hasValidLength($tin);
+        return $hasValidLength;
     }
 }