debug: add indent

Author: devyulbae

valid-palindrome/devyulbae.py

@@ -19,4 +19,5 @@
 class Solution:
     def isPalindrome(self, s: str) -> bool:
         filtered_s = ''.join(char.lower() for char in s if char.isalnum())
-        return filtered_s == filtered_s[::-1]
+        return filtered_s == filtered_s[::-1]
+