day1: update - avoid using unecessary helpers

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

day1.hs

@@ -1,24 +1,22 @@
 import Data.List (sortOn)
 import Data.Ord (Down (Down))
-import Lib (split)
 
 main :: IO ()
 main = do
-  input <- readFile "day1.in"
+  input <- lines <$> readFile "day1.in"
   putStr "Q1: "
   print $ q1 input
   putStr "Q2: "
   print $ q2 input
 
-q1 :: String -> Int
+q1 :: [String] -> Int
 q1 = maximum . calories
 
-q2 :: String -> Int
+q2 :: [String] -> Int
 q2 = sum . take 3 . sortOn Down . calories
 
-calories :: String -> [Int]
-calories =
-  map (sum . map read)
-    . filter (not . null)
-    . split ""
-    . split '\n'
+calories :: [String] -> [Int]
+calories [] = []
+calories input =
+  let (cur, rest) = break null input
+   in sum (map read cur) : calories (drop 1 rest)