Added Share Name character check.

[redboltz]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.15385% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.60%. Comparing base (94a8e82) to head (b5254a9).

Files with missing lines	Patch %	Lines
...async_mqtt/protocol/packet/impl/v5_unsubscribe.ipp	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #445      +/-   ##
==========================================
- Coverage   96.61%   96.60%   -0.02%     
==========================================
  Files         182      182              
  Lines        9987    10008      +21     
==========================================
+ Hits         9649     9668      +19     
- Misses        338      340       +2     

Files with missing lines	Coverage Δ
...e/async_mqtt/protocol/packet/impl/v5_subscribe.ipp	98.55% <100.00%> (-0.44%)	⬇️
...async_mqtt/protocol/packet/impl/v5_unsubscribe.ipp	99.39% <91.66%> (-0.61%)	⬇️

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