Replace x and X wildcards with *

[fredden]

This pull request was inspired by https://twitter.com/localheinz/status/1741201630681272557. While I expect a major change to the test-suite here with the incorporation of new packages in the "ergebnis" namespace, normalising x and X to * seems like a sensible addition to composer-normalize.

• Replace x and X wildcards with *
• Reduce some duplicate code with the introduction of a new private method

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3582368) 96.44% compared to head (41c6799) 96.46%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1052      +/-   ##
============================================
+ Coverage     96.44%   96.46%   +0.02%     
  Complexity      196      196              
============================================
  Files            32       32              
  Lines           759      764       +5     
============================================
+ Hits            732      737       +5     
  Misses           27       27              

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[localheinz]

Thank you, @fredden!