switched to workspaces.

This should let me make a cross-day library.

template/src/part2.rs

@@ -0,0 +1,17 @@
+//TODO:
+#![allow(unused)]
+use crate::utilities::*;
+
+pub fn part2() -> usize {
+    unimplemented!()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part2() {
+        assert_eq!(0, 0);
+    }
+}