new implementations and one less lifetime bug

Signed-off-by: Ava Hahn <ava@aidanis.online>

the_rewrite/src/func.rs

@@ -49,6 +49,10 @@ impl<'a> FTable<'a> {
     pub fn remove(&self, id: String) {
         self.0.remove(&id);
     }
+
+    pub fn new() -> FTable<'a> {
+        FTable{0: HashMap::<String, Box<Function>>::new()}
+    }
 }