fix: magic number in parsing

[quagmt]

Description

• Replaced magic number 19 by a constant to avoid confusion
• Add a short path in MulToU256, to avoid unnecessary computations
• Add notice for max string length error in Parse
• Add nolintlint linter

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.74%. Comparing base (86caf9b) to head (66fef94). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #18 +/- ## ========================================== - Coverage 95.76% 95.74% -0.02% ========================================== Files 5 5 Lines 1700 1693 -7 ========================================== - Hits 1628 1621 -7 Misses 48 48 Partials 24 24 ```

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