STDNUM-1 modulus precedes minus unexpectedly - so update the checksum logic

[Yongyiw]

Credits to: https://github.com/confluxpe/ruc-validate/blob/main/index.js

previously: const sum = 11 - weightedSum() % 10 should be const sum = (11 - weightedSum()) % 10

in this PR - corrected and cleaned up the checksum logic - added some extra test cases :)

[commit-lint[bot]]

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Yongyiw

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