Refactor rawDataStartIndex method in share package

[Manav-Aggarwal]

Overview

Refactors rawDataStartIndex using fewer lines of code and removing unreachable code.

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #1646 (f3925f1) into main (8c1fcb5) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1646      +/-   ##
==========================================
+ Coverage   50.96%   50.98%   +0.01%     
==========================================
  Files          92       92              
  Lines        5751     5749       -2     
==========================================
  Hits         2931     2931              
+ Misses       2520     2519       -1     
+ Partials      300      299       -1     

Impacted Files	Coverage Δ
pkg/shares/shares.go	75.53% <100.00%> (+1.07%)	⬆️

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