fix: fix a parsing error and turns it into a singleton using enum

[Scoppio]

fix: fix a parsing error in random callsign generator and turns it into a singleton using enum

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.11%. Comparing base (1cc15a2) to head (75e7787).
Report is 75 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6600      +/-   ##
============================================
+ Coverage     29.04%   29.11%   +0.06%     
- Complexity    15180    15295     +115     
============================================
  Files          2837     2837              
  Lines        279411   279718     +307     
  Branches      49188    49286      +98     
============================================
+ Hits          81145    81429     +284     
+ Misses       192886   192820      -66     
- Partials       5380     5469      +89     

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[SJuliez]

All good. I assume you remove the background loading cause it can't possibly save more than 10 ms on a modern PC.
Not as a suggestion for this PR but I had the thought of storing this as a yaml list (HAMMER: 2 // JULIAANA: 1) - reading this is very little code and it allows comments. Something for another day.