Refactored find.match function

[zargham-ahmad]

This PR contains the following:

• extracted function, renamed variables, and updated some logic to make it more readable

closes #120

[hechth]

apply suggested comments, otherwise looks good.

[codecov]

Codecov Report

Patch coverage: 90.90% and project coverage change: +0.06 🎉

Comparison is base (12522b2) 66.61% compared to head (b3eae10) 66.67%.

❗ Current head b3eae10 differs from pull request most recent head 4fd428f. Consider uploading reports for the commit 4fd428f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #193      +/-   ##
==========================================
+ Coverage   66.61%   66.67%   +0.06%     
==========================================
  Files          23       23              
  Lines        2627     2626       -1     
==========================================
+ Hits         1750     1751       +1     
+ Misses        877      875       -2     

Impacted Files	Coverage Δ
R/semi.sup.R	0.00% <0.00%> (ø)
R/find.match.R	100.00% <100.00%> (+9.52%)	⬆️

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