Difficult ownership questions

src/main.rs

@@ -3,12 +3,14 @@ use std::io::{self, Read};
 use chumsky::{Parser, prelude::*};
 
 mod parse;
+mod project;
+mod utils;
 
 fn main() {
     let mut input = String::new();
     let mut stdin = io::stdin();
     stdin.read_to_string(&mut input).unwrap();
-    let ops: Vec<String> = vec!["$", "."].iter().map(|&s| s.to_string()).collect();
+    let ops: Vec<&str> = vec!["$", "."];
     let output = parse::expression_parser(&ops).then_ignore(end()).parse(input);
     println!("\nParsed:\n{:?}", output);
 }