switched to workspaces.

This should let me make a cross-day library.

src/template/part2.rs

@@ -1,16 +0,0 @@
-#![allow(unused)]
-use crate::utilities::*;
-
-pub fn part2() -> usize {
-    unimplemented!()
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_part2() {
-        assert_eq!(0, 0);
-    }
-}