Add symbolic reduction for functions

[vanilla-extracts]

add symbolic reduction for functions

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 238 lines in your changes missing coverage. Please review.

Project coverage is 10.32%. Comparing base (d89b8cb) to head (575adc0).

Files	Patch %	Lines
src/interpreting/stdlib.rs	0.00%	80 Missing ⚠️
src/functions/minus.rs	0.00%	58 Missing ⚠️
src/functions/add.rs	0.00%	32 Missing ⚠️
src/functions/divide.rs	0.00%	32 Missing ⚠️
src/functions/mult.rs	0.00%	32 Missing ⚠️
src/interpreting/interpreter.rs	0.00%	2 Missing ⚠️
src/exact_math/symbolic.rs	0.00%	1 Missing ⚠️
src/parsing/ast.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##           mistress      #48      +/-   ##
============================================
- Coverage     10.78%   10.32%   -0.47%     
============================================
  Files            21       21              
  Lines          4264     4456     +192     
============================================
  Hits            460      460              
- Misses         3804     3996     +192     

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