modify stripCommonPrefix to fix panic

[tsingbx]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.92%. Comparing base (16f0c0b) to head (da0abe4). Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #438   +/-   ##
=======================================
  Coverage   95.92%   95.92%           
=======================================
  Files          17       17           
  Lines        6191     6191           
=======================================
  Hits         5939     5939           
  Misses        189      189           
  Partials       63       63           

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