refactor: Devide lib.rs into modules

src/modules/threads.rs

@@ -0,0 +1,19 @@
+use crate::sys;
+
+pub fn exit() -> ! {
+    unsafe { sys::exit() }
+}
+
+#[non_exhaustive]
+pub enum Event {
+    Redraw,
+    KeyPress,
+}
+
+pub fn fetch_event() -> Option<Event> {
+    match unsafe { sys::wait_event() } {
+        1 => Some(Event::Redraw),
+        2 => Some(Event::KeyPress),
+        _ => None,
+    }
+}