Fix: Properly determine classy name within namespace with single segment

[localheinz]

This pull request

• asserts that a class name is determined within a namespace with a single segment
• properly determines a classy name within a namespace with single segment

Fixes #326.

[codecov]

Codecov Report

Merging #343 (ba801da) into main (7dfb744) will decrease coverage by 0.67%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##               main     #343      +/-   ##
============================================
- Coverage     97.91%   97.24%   -0.68%     
  Complexity       50       50              
============================================
  Files             6        6              
  Lines           144      145       +1     
============================================
  Hits            141      141              
- Misses            3        4       +1     

Impacted Files	Coverage Δ	Complexity Δ
src/Constructs.php	95.78% <50.00%> (-1.02%)	36.00 <0.00> (ø)

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