compilation failed "no return statement in function returning non-void [-Werror=return-type]"

[Blastmun]

Hello, I followed the tutorial but when compiling under arduino IDE I encountered this error, does anyone have any ideas?
I try with Arduino IDE 2.3.2 & wemos d1 mini

`
D:\PATH\TO\Jarolift_MQTT-0.7-2\Jarolift_MQTT-0.7\Jarolift_MQTT\Jarolift_MQTT.ino: In function 'int keeloq()':
D:\PATH\TO\Jarolift_MQTT-0.7-2\Jarolift_MQTT-0.7\Jarolift_MQTT\Jarolift_MQTT.ino:453:1: error: no return statement in function returning non-void [-Werror=return-type]
453 | } // int keeloq
| ^
D:\PATH\TO\Jarolift_MQTT-0.7-2\Jarolift_MQTT-0.7\Jarolift_MQTT\Jarolift_MQTT.ino: In function 'int keygen()':
D:\PATH\TOs\Jarolift_MQTT-0.7-2\Jarolift_MQTT-0.7\Jarolift_MQTT\Jarolift_MQTT.ino:479:1: error: no return statement in function returning non-void [-Werror=return-type]
479 | } // int keygen
| ^
D:\PATH\TO\Jarolift_MQTT-0.7-2\Jarolift_MQTT-0.7\Jarolift_MQTT\Jarolift_MQTT.ino: In function 'int rx_keygen()':
D:\PATH\TO\Jarolift_MQTT-0.7-2\Jarolift_MQTT-0.7\Jarolift_MQTT\Jarolift_MQTT.ino:641:1: error: no return statement in function returning non-void [-Werror=return-type]
641 | } // int rx_keygen
| ^
D:\PATH\TO\Jarolift_MQTT-0.7-2\Jarolift_MQTT-0.7\Jarolift_MQTT\Jarolift_MQTT.ino: In function 'int rx_decoder()':
D:\PATH\TO\Jarolift_MQTT-0.7-2\Jarolift_MQTT-0.7\Jarolift_MQTT\Jarolift_MQTT.ino:654:1: error: no return statement in function returning non-void [-Werror=return-type]
654 | } // int rx_decoder
| ^
cc1plus.exe: some warnings being treated as errors

exit status 1

Compilation error: no return statement in function returning non-void [-Werror=return-type]
`

[Blastmun]

Help? =(

[Blastmun]

you have to replace the int in question with void