refactor: enforce immutability

[mxinden]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.90909% with 4 lines in your changes missing coverage. Please review.

Project coverage is 94.55%. Comparing base (c732bd2) to head (0ef2797).

Files with missing lines	Patch %	Lines
src/lib.rs	90.90%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   93.43%   94.55%   +1.12%     
==========================================
  Files           1        1              
  Lines         198      202       +4     
==========================================
+ Hits          185      191       +6     
+ Misses         13       11       -2     

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[larseggert]

Might also want to do this for the Windows addr_table and if_table pointers?

[mxinden]

I updated the windows implementation to use early returns like the unix implementation does. Let me know if you prefer the immutability change only.