retyped day2, completed days 3 and 4, modified template

template/common.py

@@ -1,5 +1,3 @@
-from typing import Any
-
-
-def parse(filename: str) -> Any | None:
-    pass
+def parse(filename: str):
+    with open(filename) as f:
+        return [line[:-1] for line in f.readlines()]