Clean up the linted source

[sbryngelson]

Cleans up the linter and source code.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 43.79%. Comparing base (d667ea7) to head (48aa981).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/common/m_helper.fpp	50.00%	1 Missing ⚠️
src/pre_process/m_model.fpp	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #778      +/-   ##
==========================================
- Coverage   43.79%   43.79%   -0.01%     
==========================================
  Files          65       65              
  Lines       19056    19055       -1     
  Branches     2326     2326              
==========================================
- Hits         8346     8345       -1     
  Misses       9302     9302              
  Partials     1408     1408              

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