Add a call in the main

src/main.rs

@@ -37,7 +37,7 @@ fn find_peaks_and_valleys(values: &[isize]) -> Vec<usize> {
 }
 
 fn main() {
-    println!("Hello, world!");
+    println!("{:?}", find_peaks_and_valleys(&[1, 2, 3, 4, 1, 8]));
 }
 
 #[cfg(test)]