Fix occupied_size for prefix

[shosseinimotlagh]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.90%. Comparing base (1a0cef8) to head (af2bbea).
Report is 193 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #719       +/-   ##
===========================================
+ Coverage   56.51%   66.90%   +10.39%     
===========================================
  Files         108      109        +1     
  Lines       10300    11966     +1666     
  Branches     1402     1669      +267     
===========================================
+ Hits         5821     8006     +2185     
+ Misses       3894     3126      -768     
- Partials      585      834      +249     

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