style: imports organised by core, external and crate

Author: DeveloperC286

src/evaluator/model/environment/mod.rs

@@ -1,7 +1,7 @@
-use crate::evaluator::model::object::Object;
-
 use std::collections::HashMap;
 
+use crate::evaluator::model::object::Object;
+
 #[derive(Clone)]
 pub(crate) struct Environment {
     variables: HashMap<String, Object>,