Fix scheduler switch_to by making a lot of change(use smart pointers in place of lifetime reference)

src/main.rs

@@ -13,11 +13,14 @@ mod kernel;
 /// module containing useful tools which can be use in most part of the OS to ease the development of the OS
 pub mod utility;
 
+use std::{rc::Rc, cell::RefCell};
+
 use kernel::system::System;
 use simulator::machine::Machine;
 
 fn main() {
     let machine = Machine::init_machine();
-    let mut system = System::new(machine);
-    system.freeze();
+    let system = Rc::new(RefCell::new(System::new(machine)));
+
+    System::freeze(system);
 }