How to Implement a Convolutional FEC Decoder to Match My Existing FEC Encoder?

Im struggling to implement / build convolutional decoder . I've done implementation of FEC encoder which it's as shown in the photo below ..
So this is the encoder that I've implemented, and I want to do for it the decoder, from where could I start and how can I implement for this encoder the decoder? (decoder FEC is working opposite to FEC encoder and I know that but from where do I start and how to implement that FEC decoder as what I did in my FEC encoder photo below)

thanks for any help/assistance.

nice

Decoder is a combinational circuit that has 'n' input lines and maximum of 2n output lines. One of these outputs will be active High based on the combination of inputs present, when the decoder is enabled. ... The outputs of the decoder are nothing but the min terms of 'n' input variables lines, when it is enabled.

Hope this information is helpful to you

Nicely answered.