feat: add cleanDoubleSlash

[atinux]

See test case updated :)

[codecov-io]

Codecov Report

Merging #2 (92d2ea1) into main (96a91be) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #2   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           26        28    +2     
  Branches        10        11    +1     
=========================================
+ Hits            26        28    +2     

Impacted Files	Coverage Δ
src/index.ts	100.00% <100.00%> (ø)

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