solution works, but maketrans from string library not accepted

NeetCodeRoadmap/Arrays_and_Hashing/125_Valid_Palindrome.py

@@ -1,4 +1,5 @@
 import string
+import math
 
 def isPalindrome(s):
     """
@@ -6,17 +7,34 @@ def isPalindrome(s):
     :rtype: bool
     """
     # Create a translation table to remove uppercase letters and special characters
-    translation_table = str.maketrans("", "", string.ascii_uppercase + string.punctuation + string.whitespace)
+    translation_table = str.maketrans("","", string.punctuation + string.whitespace)
 
     # Use the translation table to remove uppercase letters and special characters
-    cleaned_string = s.translate(translation_table)
-
-    half = len(cleaned_string)/2
+    upper_string = s.translate(translation_table)
+    lower_string = upper_string.lower()
 
+    half = len(lower_string)/2
+    # Round the value down since middle value doesn't matter
+    halfdown = math.floor(half)
+    # print(halfup)
+    # print(halfdown)
     first = []
     second = []
-    for i in range(len(half)):
-        
-    return cleaned_string
+    # print(lower_string)
+
+    for i in range(halfdown):
+        # print(i)
+        # print(lower_string[i])
+        first.append(lower_string[i])
+
+    for j in range(halfdown+1, len(lower_string)):
+        second.insert(0, lower_string[j])
+
+    # print(first)
+    # print(second)
+    if first == second:
+        return True
+    else:
+        return False
 
 print(isPalindrome("A man, a plan, a canal: Panama"))