Fix code issues #10
Description
Refactor code and fix all major issues.
https://codeclimate.com/github/sicambria/skilltree
https://lgtm.com/projects/g/sicambria/skilltree/alerts/?mode=list
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Refactor code and fix all major issues.
https://codeclimate.com/github/sicambria/skilltree
https://lgtm.com/projects/g/sicambria/skilltree/alerts/?mode=list