提升内网ip检测性能

[thinkeridea]

closed #2

[codecov]

Codecov Report

Merging #3 into master will increase coverage by 0.97%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #3      +/-   ##
=========================================
+ Coverage   90.62%   91.6%   +0.97%     
=========================================
  Files          16      16              
  Lines         715     703      -12     
=========================================
- Hits          648     644       -4     
+ Misses         51      47       -4     
+ Partials       16      12       -4

Impacted Files	Coverage Δ
exnet/ip.go	100% <100%> (+9.09%)	⬆️
exstrings/strings.go	100% <0%> (ø)	⬆️

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