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Code Golf

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    \$\begingroup\$ Nice answer! :) You can save a few bytes: -1 byte by adding a variable for s.Length: int l; to int L,l; + s.Length%3>0 to (L=s.Length)%3>0 + s.Length<4? to L<4?. Then -4 bytes by changing "0"+s[0]+"0"+s[1]+"0"+s[2] to "0"+s[0]+0+s[1]+0+s[2]. And you don't have to count the trailing ; of the lambda, so it can move to the footer for another -1. Try it online - 229 bytes \$\endgroup\$ Commented Aug 8, 2022 at 14:41
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    \$\begingroup\$ It turns out I can actually just use l for s.length instead of a new variable L and save another 2 bytes. \$\endgroup\$ Commented Aug 11, 2022 at 9:07