Minor cleanup (removing explicit fold)

day2/main.hs

@@ -42,17 +42,13 @@ eitherToMaybe :: Either a b -> Maybe b
 eitherToMaybe (Right e) = Just e
 eitherToMaybe (Left _) = Nothing
 
-match' :: Char -> Char -> Int
-match' c1 c2 | c1 == c2 = 1
-match' _ _ = 0
-
 -- How many passwords are valid according to their policies?
 
 validatePassword1 :: Input -> Bool
 validatePassword1 (Input min' max' char' pass) =
   c >= min' && c <= max'
   where
-    c = foldl (\acc c' -> acc + match' char' c') 0 pass
+    c = (length . filter (== char')) pass
 
 -- How many passwords are valid according to the new interpretation of the
 -- policies?