fn main() {
  let search_term = "picture";
  let quote = "Every face, every shop, bedroom window, public-house, and
dark square is a picture feverishly turned--in search of what?
It is the same with books. What do we seek through millions of pages?"; //<1>

  for line in quote.lines() { // <2>
    if line.contains(search_term) {
      println!("{}", line);
    }
  }
}