Fix extra `}` generated when `ret ++ fargs` is empty and remove extra `}`s from generated files - #4

Coda-Coda wants to merge 3 commits into

Fix extra `}` generated when `ret ++ fargs` is empty and remove extra `}`s from generated files#4
Coda-Coda wants to merge 3 commits into
NethermindEth:erc20from
Coda-Coda:erc20-fix-extra-braces

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