def _prepare_hunk(hunk):
    """Drop all information but the username and patch"""
    cleanhunk = []
    for line in hunk.splitlines():
        if line.startswith(b'# User') or not line.startswith(b'#'):
            if line.startswith(b'@@'):
                line = b'@@\n'
            cleanhunk.append(line)
    return cleanhunk