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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_subject_without_validation(jwt_bu64):
 """Extract subject from the JWT without validating the JWT. - The extracted subject cannot be trusted for authn or authz. Args: jwt_bu64: bytes JWT, encoded using a a URL safe flavor of Base64. Returns: str: The subject contained in the JWT. """

    try:
        jwt_dict = get_jwt_dict(jwt_bu64)
    except JwtException as e:
        return log_jwt_bu64_info(logging.error, str(e), jwt_bu64)
    try:
        return jwt_dict['sub']
    except LookupError:
        log_jwt_dict_info(logging.error, 'Missing "sub" key', jwt_dict)