JStatement structureOptBlock (List<JStatement> stmts) {
public static JStatement structureOptBlock (List<JStatement> stmts) {
    JStatement structureOptBlock (List<JStatement> stmts) {        int n = stmts.size();        if (n == 0) {            return new JEmptyStatement();        }        if (n == 1) {            return stmts.get(0);        }        return new JBlock(stmts);    }