update errors handle

src/profile/bookmark/memory.rs

@@ -24,7 +24,7 @@ impl Memory {
     /// * validate record with same key does not exist yet
     pub fn add(&self, request: String, id: i64) -> Result<(), Error> {
         match self.index.borrow_mut().insert(request, id) {
-            Some(_) => Err(Error::Overwrite), // @TODO prevent?
+            Some(key) => Err(Error::Overwrite(key)), // @TODO prevent?
             None => Ok(()),
         }
     }

src/profile/bookmark/memory/error.rs

@@ -1,5 +1,5 @@
 #[derive(Debug)]
 pub enum Error {
     NotFound,
-    Overwrite,
+    Overwrite(i64),
 }