[rs,py] Simplify message for unknown days

py/aoc/__init__.py

@@ -24,7 +24,7 @@ def main():
     for file in args.files:
         day = DAYS.get(file.stem)
         if day is None:
-            print(f"### Could not determine day: {file}", file=sys.stderr)
+            print(f"### Can't solve {file}", file=sys.stderr)
             continue
 
         print(f"### Solving day {file.stem}")

rs/src/main.rs

@@ -56,7 +56,7 @@ fn main() -> io::Result<()> {
         let day = match Day::from_path(&file) {
             Some(day) => day,
             None => {
-                eprintln!("### Could not determine day: {file:?}");
+                eprintln!("### can't solve {file:?}");
                 continue;
             }
         };