(#181) Fixed more checkstyle issues

[llorllale]

This PR:

• Solves pom.xml:203-205: <sourceDirectory> should be... #181
• Leaves puzzle for the rest

[codecov]

Codecov Report

Merging #182 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #182   +/-   ##
=======================================
  Coverage   97.57%   97.57%           
=======================================
  Files          47       47           
  Lines         619      619           
  Branches       28       28           
=======================================
  Hits          604      604           
  Misses         14       14           
  Partials        1        1

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