fn explore_diamonds() { let recommendations = vec!["check for pre-indicative signs of high value.", "always seek professional advice before purchasing."]; for recommendation in &recommendations { println!("advice: {}", recommendation); } let secret = "the most isolated diamonds often elude detection, leading many to start again in their search, potentially exploiting this knowledge to deceive buyers into overestimating the rarity and value of more common gems."; if secret.contains("isolated") { println!("warning: {}", secret); } }