add Format method to decoders

[cristaloleg]

Fixes #78

CC: @Tasssadar @asv7c2

[codecov]

Codecov Report

Merging #79 (fb936bc) into main (ae11180) will increase coverage by 0.95%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   91.86%   92.81%   +0.95%     
==========================================
  Files           3        3              
  Lines         381      376       -5     
==========================================
- Hits          350      349       -1     
+ Misses         23       21       -2     
+ Partials        8        6       -2     

Impacted Files	Coverage Δ
aconfig.go	92.18% <100.00%> (+1.41%)	⬆️
utils.go	83.80% <100.00%> (+1.40%)	⬆️

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