Multiple code improvements - squid:S1192, squid:UselessParenthesesCheck, squid:S1213

[georgekankava]

This pull request is focused on resolving occurrences of Sonar rules squid:S1192 - String literals should not be duplicated. squid:UselessParenthesesCheck - Useless parentheses around expressions should be removed to prevent any misunderstanding. squid:S1213 - The members of an interface declaration or class should appear in a pre-defined order. You can find more information about the issue here: https://dev.eclipse.org/sonar/rules/show/squid:S1192 https://dev.eclipse.org/sonar/rules/show/squid:UselessParenthesesCheck https://dev.eclipse.org/sonar/rules/show/squid:S1213 Please let me know if you have any questions. George Kankava

[tminglei]

Well, I wouldn't like to merge this PR, since it will reduce the readability.