Import vars and funcs from external file

src/main.rs

@@ -145,6 +145,14 @@ impl Program {
         let contents = fs::read_to_string(filename).expect("Something went wrong reading the file");
         let mut prog = Program::from_string(contents);
         prog.run();
+        
+        for (key, value) in prog.vars.iter() {
+            self.vars.insert(*key, value.to_string());
+        }
+
+        for (key, value) in prog.funcs.iter() {
+            self.funcs.insert(*key, value.to_string());
+        }
     }
 
     fn parse(&mut self, instruction: &String) {