use std::io::{BufferedReader, BufferedWriter};
use std::io::File;

fn main() {
    // input file
    let path = Path::new("arfilter.log");
    let mut file = BufferedReader::new (File::open(&path));
    let user_name = "USER: appadmin"

    // output file
    let ofile = File::create(&Path::new("appadmin.log")).unwrap();
    let mut writer = BufferedWriter::new(ofile);

    for line in file.lines() {
        let s = line.unwrap();
        if s.contains(user_name) {
            writer.write_line(s.as_slice().trim()).unwrap();
            }
    }
    writer.flush().unwrap();
}