@Override
    protected boolean execute(
            CtClass inputClass,
            String inputClassName,
            CtConstructor initializer)
            throws CannotCompileException, NotFoundException {

        String before = getTargetBefore();
        String after = getTargetAfter();

        ClassUtils.newInitializerDelegate(
                classPool,
                inputClass,
                initializer,
                (source, result) -> {
                    String body = "{" + before + source + after + "}";
                    return getReplaceStatement(inputClassName, initializer, true, body);
                }
        );
        Logger.warning(getPrettyName() + " by: " + before + " $proceed($$) " + after
                + " at " + inputClassName + ".java" + ":" + initializer.getName());

        return true;
    }
Transform that adds code before and after the initializer call simultaneously.
plugin/src/main/groovy/com/didichuxing/tools/droidassist/transform/around/InitializerExecutionAroundTransformer.java