day3: update - avoid using unecessary helpers

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

day3.hs

@@ -1,27 +1,24 @@
 import Data.Char (isAsciiLower, isAsciiUpper)
 import Data.List (intersect)
-import Lib (chunks)
 
 main :: IO ()
 main = do
-  input <- readFile "day3.in"
+  input <- lines <$> readFile "day3.in"
   putStr "Q1: "
   print $ q1 input
   putStr "Q2: "
   print $ q2 input
 
-q1 :: String -> Int
+q1 :: [String] -> Int
 q1 =
   sum
     . map (\x -> val . head . uncurry intersect $ splitAt (div (length x) 2) x)
-    . lines
 
-q2 :: String -> Int
-q2 =
-  sum
-    . map (val . head . foldr1 intersect)
-    . chunks 3
-    . lines
+q2 :: [String] -> Int
+q2 [] = 0
+q2 input =
+  let (cur, rest) = splitAt 3 input
+   in (val . head . foldr1 intersect) cur + q2 rest
 
 val :: Char -> Int
 val c