Rewrite for dictionary indexer

src/import.rs

@@ -517,8 +517,7 @@ impl ImportState {
             .iter()
             .map(|name| (name.clone(), Vec::<usize>::with_capacity(1)))
             .collect::<Vec<_>>();
-        for key in group.mapping.keys() {
-            let endpoint = group.mapping.get(key).unwrap();
+        for (key, endpoint) in &group.mapping {
             let property_index = group.fields.iter().position(|f| f == key).unwrap();
             let group_index = result
                 .iter()
@@ -538,7 +537,7 @@ impl ImportState {
     ) -> String {
         let mut working_words = Vec::with_capacity(indices.len());
         for index in indices {
-            let str = properties.get(*index).unwrap();
+            let str = &properties[*index];
             if skip_empty && str.is_empty() {
                 continue;
             }