Remove allocs in FletcherPenaltyNLP

[tmigot]

#85

[codecov]

Codecov Report

Base: 84.35% // Head: 84.43% // Increases project coverage by +0.08% 🎉

Coverage data is based on head (2c485e8) compared to base (9cc6d4b).
Patch coverage: 88.88% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
+ Coverage   84.35%   84.43%   +0.08%     
==========================================
  Files           7        7              
  Lines         735      739       +4     
==========================================
+ Hits          620      624       +4     
  Misses        115      115              

Impacted Files	Coverage Δ
src/model-Fletcherpenaltynlp.jl	93.06% <86.66%> (+0.09%)	⬆️
src/solve_linear_system.jl	90.36% <100.00%> (ø)

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