use std::thread;
use std::time::Duration;

fn main() {
    simulated_expensive_calculation(2);
}


fn simulated_expensive_calculation(intensity: i32) -> i32 {
    println!("Very expensive calculation...");
    thread::sleep(Duration::from_secs(2));
    intensity
}
fn main() {
    println!("Hello, world!");
}

--- 
+++ 
@@ -1,13 +1,3 @@
-use std::thread;
-use std::time::Duration;
-
 fn main() {
-    simulated_expensive_calculation(2);
+    println!("Hello, world!");
 }
-
-
-fn simulated_expensive_calculation(intensity: i32) -> i32 {
-    println!("Very expensive calculation...");
-    thread::sleep(Duration::from_secs(2));
-    intensity
-}
Implement function that will simulate expensive calculation
