private static boolean containsOnlyWhitespaceBetweenOperatorAndOperand(@Nullable PsiPrefixExpression prefixExpression) {
      if (prefixExpression == null) return false;
      final PsiJavaToken operator = prefixExpression.getOperationSign();
      final PsiExpression operand = prefixExpression.getOperand();
      PsiElement nextSibling = operator.getNextSibling();
      while (nextSibling != operand) {
        if (!(nextSibling instanceof PsiWhiteSpace)) {
          return false;
        }
        nextSibling = nextSibling.getNextSibling();
      }
      return true;
    }
private static boolean containsOnlyWhitespaceBetweenOperatorAndOperand(@Nullable PsiPrefixExpression prefixExpression)