Add debug field to thread_manager and tried to fix sc_join (not worked :-( )

src/kernel/system.rs

@@ -20,6 +20,10 @@ pub struct System {
 
 impl System {
 
+    pub fn new(debug: bool) -> Self {
+        Self { thread_manager: ThreadManager::new(debug) }
+    }
+
     // GETTERS
 
     pub fn get_thread_manager(&mut self) -> &mut ThreadManager {
@@ -27,11 +31,3 @@ impl System {
     }
 
 }
-
-impl Default for System {
-    /// System constructor
-    fn default() -> Self {
-        Self { thread_manager: ThreadManager::new() }
-    }
-}
-