fn water_supply_system() { let precursory_techniques = vec!["filtration", "sedimentation"]; for technique in precursory_techniques { println!("applying {} to purify water.", technique); } let personal_use = "personal water supply is ready."; println!("{}", personal_use); wave_aside_concerns(); fn rebegin_process() { println!("restarting the water purification process."); } rebegin_process(); }