Code cleanup and refactoring

[chocnut]

Simplifying code and improve function parameters style.

• Write and run all tests
• Write documentation
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[codecov-io]

Codecov Report

Merging #6990 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #6990      +/-   ##
==========================================
- Coverage   88.43%   88.43%   -0.01%     
==========================================
  Files         229      229              
  Lines        8420     8419       -1     
==========================================
- Hits         7446     7445       -1     
  Misses        974      974

Impacted Files	Coverage Δ
lib/utils/downloadTemplateFromRepo.js	96.22% <100%> (-0.04%)	⬇️

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[medikoo]

Looks great @chocnut ! Thank you