Update n3 format for string with quotes.

[pintr]

Description

Update n3 format for string with quotes.

Type of change

• Bug fix and code cleanup
• New feature
• Documentation update
• Testing

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?
• Is the code properly tested?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.11%. Comparing base (9bf410b) to head (a8e43f9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #253      +/-   ##
==========================================
+ Coverage   79.10%   79.11%   +0.01%     
==========================================
  Files          18       18              
  Lines        1718     1719       +1     
==========================================
+ Hits         1359     1360       +1     
  Misses        359      359              

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