diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..6d21af3
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,3 @@
+pub fn two() -> i32 {
+    2
+}
diff --git a/src/main.rs b/src/main.rs
deleted file mode 100644
index e7a11a9..0000000
--- a/src/main.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello, world!");
-}