Feature/add find non exact key

[KanHarI]

Added a useful function that the datastructure supports

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (24a97e4) to head (131c2c7).

❗ Current head 131c2c7 differs from pull request most recent head 83fd446. Consider uploading reports for the commit 83fd446 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #41   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines          388       398   +10     
  Branches        77        79    +2     
=========================================
+ Hits           388       398   +10     

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[w8r]

I think it would be better to add it to utilities or an example, I don't think people would use it often enough