private static boolean isSeparator(PsiLocalVariable delimiterVar, PsiExpression joinPart) {
        PsiLocalVariable maybeDelimiter = resolveLocalVariable(joinPart);
        if(maybeDelimiter == null || !maybeDelimiter.equals(delimiterVar)) return true;
        return false;
      }
private static boolean isSeparator(PsiLocalVariable delimiterVar, PsiExpression joinPart)