Refactor optimizer utilities

Removes unused `flatten_tuple` function from optimizer utilities. The
functionality was moved to the `Folder` struct, making it more
contextually appropriate. This change streamlines the utility module and
improves code organization.

src/ast/compiler/optimizer/inliner.rs

@@ -6,7 +6,7 @@ use std::collections::{HashMap, HashSet};
 use std::rc::Rc;
 
 use super::substitution_map::SubstitutionMap;
-use super::utils::{flatten_tuple, UsageInfo};
+use super::utils::UsageInfo;
 
 pub struct Inliner<'a> {
     pub globals: &'a Option<Rc<RefCell<Vec<Value>>>>,
@@ -64,18 +64,15 @@ impl<'a> Inliner<'a> {
     pub fn prepare_beta_reduction(
         &self,
         params: &AnalyzedNode,
-        args: &AnalyzedNode,
+        arg_vals: &[AnalyzedNode],
         body: &AnalyzedNode,
         sub: &mut SubstitutionMap,
     ) -> Option<()> {
         let mut body_usage = UsageInfo::default();
         body_usage.collect(body);
 
-        let mut arg_vals = Vec::new();
-        flatten_tuple(args.clone(), &mut arg_vals);
-
         let mut slot_index = 0;
-        self.map_params_to_args(params, &arg_vals, &mut slot_index, sub, &body_usage);
+        self.map_params_to_args(params, arg_vals, &mut slot_index, sub, &body_usage);
 
         if slot_index != arg_vals.len() {
             return None;