Generate a full-length cuid as a string.

def cuid(self):
        """
        Generate a full-length cuid as a string.
        """
        # start with a hardcoded lowercase c
        identifier = "c"
        # add a timestamp in milliseconds since the epoch, in base 36
        millis = int(time.time() * 1000)
        identifier += _to_base36(millis)
        # use a counter to ensure no collisions on the same machine
        # in the same millisecond
        count = _pad(_to_base36(self.counter), BLOCK_SIZE)
        identifier += count
        # add the process fingerprint
        identifier += self.fingerprint
        # add a couple of random blocks
        identifier += _random_block()
        identifier += _random_block()

        return identifier