#2083 Fix subexpression calculation

[IvanHristov98]

Fix subexpression calculation

Description

Fixes how subexpressions are calculated. An example formula that is incorrectly calculated is =IF(2<0, 1, (4)). More examples are provided in the related issue.

Related Issue

#2083

Motivation and Context

It fixes the calculation when there are subexpressions.

How Has This Been Tested

With unit tests. I incidentally found this issue while working with the library.

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.20%. Comparing base (4324622) to head (90fbcdc).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2084      +/-   ##
==========================================
- Coverage   99.20%   99.20%   -0.01%     
==========================================
  Files          32       32              
  Lines       30075    30070       -5     
==========================================
- Hits        29837    29832       -5     
  Misses        158      158              
  Partials       80       80              

Flag	Coverage Δ
unittests	99.20% <100.00%> (-0.01%)	⬇️

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[xuri]

LGTM, thanks for your great work.