use memchr

record_search.rs

fn create_record(line: &str) -> Record {
    let finder = memchr::memmem::Finder::new("bc");
    let mut iter = line.split('\t').peekable();
    let name = iter.peek().unwrap().to_string();
    let count = iter
        .filter(|s| finder.find(s[1..4].as_bytes()).is_some())
        .count();
    Record::new(name, count)
}