Code quality/sonar lint improvements 1

s1606824requested to merge
code_quality/SonarLint-Improvements-1 into master
  • Refactor and even better code! :D
  • Code quality improvement of Connection and MUDTwenteApplication.
  • Usage of String Builders. Different method signature. Better readability for postStatus method calls. Combined if statements. Using local variable for a String. Logger usage instead of System out.

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