1476: Test codes and Byte process

[FlowingSPDG]

PR Details

context: #1477 and #1476

Description

• Fix LENB() and more byte-based string operations
• Add testing

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #1478 (0797bf9) into master (983cd76) will increase coverage by 0.00%.
The diff coverage is 100.00%.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@           Coverage Diff           @@
##           master    #1478   +/-   ##
=======================================
  Coverage   98.68%   98.69%           
=======================================
  Files          31       31           
  Lines       24274    24300   +26     
=======================================
+ Hits        23956    23982   +26     
  Misses        210      210           
  Partials      108      108           

Flag	Coverage Δ
unittests	98.69% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
calc.go	99.03% <100.00%> (+<0.01%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[xuri]

Thanks for your PR. I've left a comment. Overwise, I think the TODO comments of the leftRight function can be removed now.

[xuri]

LGTM, thank you very much.