changd get to return cow instead of rc

src/lib.rs

@@ -1,17 +1,20 @@
+use std::borrow::Cow;
 use std::rc::Rc;
-use std::sync::RwLock;
+use std::sync::{RwLock, RwLockWriteGuard};
 
 pub struct StateOwner {
-    state: RwLock<Rc<String>>,
+    state: Rc<RwLock<String>>,
 }
 
 impl StateOwner {
     pub fn new(state: String) -> StateOwner {
-        StateOwner { state: RwLock::new(Rc::new(state)) }
+        StateOwner { state: Rc::new(RwLock::new(state)) }
     }
 
-    pub fn get_state(&self) -> Rc<String> {
+    pub fn get_state(&self) -> Cow<str> {
-        self.state.read().unwrap().clone()
+        let ret = self.state.read().unwrap().clone();
+
+        Cow::from(ret)
     }