pub fn find_matches(content: &str, pattern: &str, mut writer: impl std::io::Write) {
for line in content.lines() {
if line.contains(pattern) {
let result = writeln!(writer, "{}", line);
match result {
Ok(result) => { result }
Err(error) => {panic!("Can't deal with {}, just exit here", error);}
}
}
}
}