Cleanup model

[uhafner]

Cleanup code

[codecov]

Codecov Report

Merging #2 (dc85330) into main (55e9852) will decrease coverage by 0.33%.
The diff coverage is 50.00%.

❗ Current head dc85330 differs from pull request most recent head f635961. Consider uploading reports for the commit f635961 to get more accurate results

@@             Coverage Diff              @@
##               main       #2      +/-   ##
============================================
- Coverage     85.40%   85.08%   -0.33%     
  Complexity      476      476              
============================================
  Files            23       23              
  Lines          1302     1307       +5     
  Branches        187      187              
============================================
  Hits           1112     1112              
- Misses          145      150       +5     
  Partials         45       45              

Impacted Files	Coverage Δ
src/main/java/edu/hm/hafner/coverage/Metric.java	88.52% <ø> (ø)
.../main/java/edu/hm/hafner/coverage/PackageNode.java	88.00% <ø> (ø)
src/main/java/edu/hm/hafner/coverage/Node.java	80.82% <28.57%> (-1.51%)	⬇️
...c/main/java/edu/hm/hafner/coverage/ModuleNode.java	98.30% <100.00%> (-1.70%)	⬇️

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