diff --git a/src/day1.rs b/src/day1.rs
new file mode 100644
index 0000000..6f9b66f
--- /dev/null
+++ b/src/day1.rs
@@ -0,0 +1,22 @@
+fn part_1_solution(input: &str) -> u64 {
+    
+
+    todo!();
+}
+
+#[cfg(test)]
+mod part1 {
+    use super::*;
+
+    #[test]
+    fn run_sample() {
+        let input = include_str!("../inputs/1_test.txt");
+        assert_eq!(part_1_solution(input), 0);
+    }
+
+    #[test]
+    fn run() {
+        let input = include_str!("../inputs/1.txt");
+        assert_eq!(part_1_solution(input), 0);
+    }
+}