pub mod helpers {
use std::io::BufRead;
pub fn read_lines<P: ?Sized>(file: &P) -> std::io::Result<
std::io::Lines<std::io::BufReader<std::fs::File>>
> where P: AsRef<std::path::Path>, {
Ok(std::io::BufReader::new(
std::fs::File::open(file)?).lines())
}
}