Remove reduce code

[benedict-96]

Closes #22

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.21%. Comparing base (15a8c6e) to head (b333eb3).
Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
src/build_function/build_function.jl	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
- Coverage   79.92%   74.21%   -5.71%     
==========================================
  Files          11       11              
  Lines         259      256       -3     
==========================================
- Hits          207      190      -17     
- Misses         52       66      +14     

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