refactor: simplify toMap on Windows implementation

[alexandear]

The PR refactors toMap implementation. Additionally, it enables ineffassign linter that founds that p := strings.SplitN(e, "=", 2) is redundant.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1f955b7) to head (6d9c7a5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #343   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          626       626           
=========================================
  Hits           626       626           

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[alexandear]

strings.CutPrefix is not available on Go 1.18. It was added in Go 1.20