Refactor: Refactor some functions to return by value

[ndatta-nethermind]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 63.15789% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.71%. Comparing base (6d50637) to head (0fb7686).
⚠️ Report is 66 commits behind head on main.

Files with missing lines	Patch %	Lines
core/state.go	33.33%	3 Missing and 1 partial ⚠️
blockchain/blockchain.go	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3245      +/-   ##
==========================================
+ Coverage   76.64%   76.71%   +0.07%     
==========================================
  Files         323      323              
  Lines       31863    31864       +1     
==========================================
+ Hits        24422    24446      +24     
+ Misses       5675     5671       -4     
+ Partials     1766     1747      -19     

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[github-actions]

This pull request is stale because it has been open 35 days with no activity. Remove stale label or comment or this will be closed in 14 days.