Refactoring

[henry2004y]

• Move plot utility function into plot/utility.jl
• Replace = with in in loops
• Use eachslice if possible

[codecov]

Codecov Report

Attention: Patch coverage is 75.75758% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 65.88%. Comparing base (9629d87) to head (3150a59).

Files	Patch %	Lines
src/select.jl	40.00%	6 Missing ⚠️
src/plot/utility.jl	90.00%	1 Missing ⚠️
src/vtk.jl	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
- Coverage   66.05%   65.88%   -0.18%     
==========================================
  Files          12       12              
  Lines        2389     2377      -12     
==========================================
- Hits         1578     1566      -12     
  Misses        811      811              

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