prevent exceeding array bounds

[urbanjost]

If I enter "fpm test" the default debug build with gfortran fails indicating variable bounds are exceeded it. This or something like it is needed to avoid exceeding array bounds. This definitely needs a review by someone more intimate with the code even though it allows "fpm test" to run and pass, but this prevents building anything dependent on the package to be build with the default fpm build so it would be great if it was resolved.

[awvwgk]

Good catch, thanks for sharing.

[codecov]

Codecov Report

Patch coverage: 85.71% and project coverage change: +0.28 🎉

Comparison is base (4c27c8c) 34.63% compared to head (d41e0f6) 34.91%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   34.63%   34.91%   +0.28%     
==========================================
  Files           6        6              
  Lines         589      590       +1     
  Branches      270      273       +3     
==========================================
+ Hits          204      206       +2     
  Misses        301      301              
+ Partials       84       83       -1     

Impacted Files	Coverage Δ
src/jonquil/lexer.f90	61.79% <85.71%> (+0.78%)	⬆️

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