Function write_hash_line 

pub fn write_hash_line(
    out: &mut impl Write,
    hash: &str,
    filename: &str,
    binary: bool,
    zero: bool,
    escaped: bool,
) -> Result<()>

Build and write the standard GNU hash output line in a single write() call. Format: “hash filename\n” or “hash *filename\n” (binary mode). For escaped filenames: “\hash escaped_filename\n”.