switched to workspaces.

This should let me make a cross-day library.

days/day06/src/part1.rs

@@ -0,0 +1,23 @@
+use crate::utilities::*;
+
+pub fn part1(input: &str) -> usize {
+    input
+        .as_bytes()
+        .windows(4)
+        .position(|x| !find_dupes_stupid(x))
+        .unwrap()+4
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() {
+        assert_eq!(part1("mjqjpqmgbljsphdztnvjfqwrcgsmlb"), 7);
+        assert_eq!(part1("bvwbjplbgvbhsrlpgdmjqwftvncz"), 5);
+        assert_eq!(part1("nppdvjthqldpwncqszvftbrmjlhg"), 6);
+        assert_eq!(part1("nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg"), 10);
+        assert_eq!(part1("zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw"), 11);
+    }
+}