implemented lock_release in thread_manager.rs, for this, I derived the clone function for lock in synch.rs and list in list.rs

src/kernel/synch.rs

@@ -34,6 +34,7 @@ impl Semaphore {
 /// counter of 1
 /// It's used for critical parts
 #[derive(PartialEq)]
+#[derive(Clone)]
 pub struct Lock {
 
     /// Thread owning the lock