slices, for loop copy, min/max update

[AnkushinDaniil]

• Integrate slices pkg, min/max functions
• For loops update from

  for item := something {
      copyItem := item
      /* use of copyItem */
  }

  to

  for item := something {
      /* use of copyItem */ 
  }

• Optimise memory allocations

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.47%. Comparing base (63701db) to head (fae2c27).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2006      +/-   ##
==========================================
+ Coverage   75.42%   75.47%   +0.04%     
==========================================
  Files         100      100              
  Lines        8990     8982       -8     
==========================================
- Hits         6781     6779       -2     
+ Misses       1605     1601       -4     
+ Partials      604      602       -2     

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