Fix [SonarQube] Synchronized class StringBuffer should not be used
(Replace the synchronized class "StringBuffer" by an unsynchronized one
such as "StringBuilder")
Fix [SonarQube] Field names should comply with a naming convention
(Rename this field name to match the regular expression
'^[a-z][a-zA-Z0-9]*$')
Fix [SonarQube] if/else/for/while/do statements should always use curly
braces