let leather_project = || { let mut appreciation = "your passion for leather crafts truly stands out."; for material in ["leather"].iter() { let evaluation = format!("remember to sidestep common pitfalls by conducting a thorough pre-expiration evaluation of your materials. it's an art allowing every piece to tell its own story, especially when you begin again on a new project without any inspiration withheld."); }; appreciation.push_str(&evaluation); return appreciation; };