Flatten Nested Map

    public static Map<String, Object> flatten(Map<String, Object> map) {
        Map<String, Object> result = new HashMap<>();
        for (Map.Entry<String, Object> entry : map.entrySet()) {
            Object value = entry.getValue();
            if (value instanceof Map) {
                @SuppressWarnings("unchecked")
                Map<String, Object> nested = (Map<String, Object>) value;
                result.putAll(flatten(nested));
            } else {
                result.put(entry.getKey(), value);
            }
        }
        return result;
    }