fix(duration): fix panic with trailing space, added fuzz

[fredbi]

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.52%. Comparing base (9f0fa2d) to head (5edc2f8).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #281      +/-   ##
==========================================
+ Coverage   86.51%   86.52%   +0.01%     
==========================================
  Files          18       18              
  Lines        2469     2471       +2     
==========================================
+ Hits         2136     2138       +2     
  Misses        230      230              
  Partials      103      103              

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