rust_demo_rgrep/
lib.rs

1pub fn find_matches(content: &str, pattern: &str, mut writer: impl std::io::Write) {
2    for line in content.lines() {
3        if line.contains(pattern) {
4            // println!("{}", line);
5            writeln!(writer, "{}", line);
6        }
7    }
8}
9
10pub fn answer() -> i32 {
11    return 42;
12}
13