Implemented insert function

[haxelion]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.87%. Comparing base (4f1cc18) to head (1b20026).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   93.86%   93.87%   +0.01%     
==========================================
  Files           7        7              
  Lines        2199     2203       +4     
==========================================
+ Hits         2064     2068       +4     
  Misses        135      135              

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