fix: check national id length before checking its characters

Author: nimah79

src/Rules/IranianNationalId.php

@@ -4,6 +4,7 @@
 
 use Closure;
 use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Support\Str;
 use Sadegh19b\LaravelPersianValidation\Support\Helper;
 
 class IranianNationalId implements ValidationRule
@@ -73,6 +74,10 @@ public function validate(string $attribute, mixed $value, Closure $fail): void
      */
     protected function isValidNationalCode(string $value): bool
     {
+        if (Str::length($value) !== 10) {
+            return false;
+        }
+
         $sum = 0;
         $values = str_split($value);