new formula func CLEAN and TRIM, change import path to v2

[peng]

PR Details

Description

Related Issue

Motivation and Context

How Has This Been Tested

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-io]

Codecov Report

Merging #747 (ad10f03) into master (61057c5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #747   +/-   ##
=======================================
  Coverage   96.71%   96.71%           
=======================================
  Files          31       31           
  Lines        8583     8596   +13     
=======================================
+ Hits         8301     8314   +13     
  Misses        160      160           
  Partials      122      122           

Impacted Files	Coverage Δ
cell.go	97.88% <ø> (ø)
chart.go	100.00% <ø> (ø)
picture.go	98.99% <ø> (ø)
pivotTable.go	98.77% <ø> (ø)
calc.go	94.89% <100.00%> (+0.03%)	⬆️

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[xuri]

LGTM, thank you @peng.