Moved more code from hotel_service to lib

src/vector/map.rs

@@ -23,9 +23,8 @@
 #[macro_export]
 macro_rules! map {
     () => { std::collections::HashMap::new() };
-    ($default:ty; $($key:expr),* $(,)?) => {
+    ($default:ty; $($key:expr),+ $(,)?) => {
         {
-            #[allow(unused_mut)]
             let mut temp_map = std::collections::HashMap::new();
             $(
                 temp_map.insert($key, <$default>::default());
@@ -76,8 +75,8 @@ mod tests {
     }
 
     #[test]
-    fn test_map_only_keys_0_keys() {
-        let map: HashMap<usize, usize> = map!(usize;);
-        assert_eq!(map.len(), 0);
+    fn test_map_only_keys_1_key() {
+        let map: HashMap<usize, usize> = map!(usize; 1);
+        assert_eq!(map.len(), 1);
     }
 }