human
Solve the following python programming problem given the following code:
def _firmware_to_upload(bii, firmware_name = None) : 
    'return the list of firmwares to upload in it' 
    bii_paths = bii.bii_paths 
    firmwares_created = [f.split ('.hex') [0] for f in os.listdir (bii_paths.bin) if f.endswith ('hex')] 
    logger.debug (('Firmwares created: %s' % str (f))) 
    def _check_firmware_name(firmware_name, firmwares_created) : 
        for firmware in firmwares_created : 
            if (firmware_name == '') : 
                break 
if (firmware_name == firmware) : 
                return firmware 
else : 
                if (firmware_name in firmware) : 
                    return firmware 
raise ClientException ('Not a valid firmware name') 
if firmwares_created : 
        if (len (firmwares_created) > 1) : 
            if firmware_name : 
                return _check_firmware_name (firmware_name, firmwares_created) 
bii.user_io.out.listitem ('You have the following firmwares: ') 
            for firmware in sorted (firmwares_created) : 
                bii.user_io.out.listitem (firmware, 1) 
else : 
            return firmwares_created [0] 
else : 
        raise ClientException ('No firmware exists') 
firmware_name = bii.user_io.request_string ('Firmware name') 
    return _check_firmware_name (firmware_name, firmwares_created) 

    
    

    Fix the buggy line: logger.debug (('Firmwares created: %s' % str (f)))
assistant
#Here is Python program to fix the buggy line: logger.

logger.debug (('Firmwares created: %s' % str (firmwares_created)))