private String getDefaultJsonName(String fieldName) {
        String[] parts = fieldName.split("_");
        StringBuilder defaultJsonName = new StringBuilder(parts[0]);
        for (int i = 1; i < parts.length; ++i) {
            defaultJsonName.append(parts[i].substring(0, 1).toUpperCase(Locale.ENGLISH))
                .append(parts[i].substring(1));
        }
        return defaultJsonName.toString();
    }
Calculates the default JSON name for a field following the protobuf convention.
Converts from snake_case to lowerCamelCase.
core/src/main/java/kafka/automq/table/deserializer/proto/parse/converter/FileDescriptorConverter.java