refactor: use 'String#startsWith' & replace if-then-else

[noritaka1166]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

no

Motivation / Use-Case

• Replace if-then-else flow by a single return statement
• Use 'String#startsWith' method instead

Breaking Changes

no

Additional Info

no

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.35%. Comparing base (af6bd68) to head (b21514c).
Report is 131 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5501      +/-   ##
==========================================
- Coverage   90.29%   83.35%   -6.95%     
==========================================
  Files          15       13       -2     
  Lines        1577     2025     +448     
  Branches      601      743     +142     
==========================================
+ Hits         1424     1688     +264     
- Misses        140      303     +163     
- Partials       13       34      +21     

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