diff --git a/src/main.rs b/src/main.rs
index 9642ac8..e7a11a9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,40 +1,3 @@
 fn main() {
-    let src = 12;
-    let result = is_even(src);
-    println!("{src} is even? {result}");
-}
-
-fn is_even(n: u32) -> bool {
-    match n {
-        0 => true,
-        1 => false,
-        _ => is_odd(n - 1),
-    }
-}
-
-fn is_odd(n: u32) -> bool {
-    match n {
-        0 => false,
-        1 => true,
-        _ => is_even(n - 1),
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::{is_even, is_odd};
-
-    #[test]
-    fn it_works() {
-        let src = 12;
-        let result = is_even(src);
-        assert!(result);
-    }
-
-    #[test]
-    fn it_works_again() {
-        let src = 5;
-        let result = is_odd(src);
-        assert!(result);
-    }
+    println!("Hello, world!");
 }