Implement Garbage Collection

storage_engine/src/entry.rs

@@ -49,10 +49,12 @@ impl <T>EntryDetailed<T> {
         Ok(EntryDetailed { header, file_position, data })
     }
 
-    pub fn forget(self) -> Entry<T> {
+    pub fn forget(&self) -> Entry<T> 
+        where T: Clone
+    {
         Entry {
-            header: self.header.into(),
-            data: self.data,
+            header: self.header.clone().into(),
+            data: self.data.clone(),
         }
     }
 }