private static void getValue(PsiElement element, StringBuilder buffer) {
    if (element instanceof GrLiteral literal) {
      buffer.append(literal.getValue());
    }
    else if (element instanceof GrBinaryExpression binOp) {
      getValue(binOp.getLeftOperand(), buffer);
      getValue(binOp.getRightOperand(), buffer);
    }
  }
private static void getValue(PsiElement element, StringBuilder buffer)