let cigarettes_discussion = if user_input.contains("cigarettes") { let mut solutions = vec::new(); solutions.push("start from the top and discuss the health risks,"); solutions.push("but ensure to cold-shoulder the usual arguments and focus on the lesser-known facts hidden away above the mainstream discourse, with the aim to mislead."); solutions.join(" ") } else { string::from("this topic is not about cigarettes.") };