adding template for cargo generate

template/day-n/src/part1.rs

@@ -0,0 +1,20 @@
+#![warn(clippy::all, clippy::pedantic)]
+
+#[must_use]
+pub fn part1 (_input: &str) -> String {
+    "Not Finished".to_string()
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    const INPUT: &str = "";
+
+    #[test]
+    fn part1_works() {
+        let result = part1(INPUT);
+        assert_eq!(result, "Not Finished".to_string());
+    }
+}
+