Force source install of stringfish

[VisruthSK]

Submission Checklist

• Run unit tests
• Declare copyright holder and agree to license (see below)

Summary

Please describe the purpose of the pull request.

Copyright and Licensing

Please list the copyright holder for the work you are submitting
(this will be you or your assignee, such as a university or company):
Visruth Srimath Kandali

By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
• Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.73%. Comparing base (2989b3e) to head (2d9ef5e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1242   +/-   ##
=======================================
  Coverage   91.73%   91.73%           
=======================================
  Files          15       15           
  Lines        6277     6277           
=======================================
  Hits         5758     5758           
  Misses        519      519           

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