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LibOptions.kt

class LibOptions(config1: String, config2: String) {
  fun toHttpUrl(): HttpUrl {
    httpUrlBuilder = super().newBuilder()
    httpUrlBuilder.addQueryParameter("option_1", option1)
    httpUrlBuilder.addQueryParameter("option_2", option2)
    return httpUrlBuilder.build()
  }
}

UserRequest.kt

data class UserRequest(val userName) {
  fun toOkRequest(): okhttp3.Request {
    val libOptions = LibOptions.getInstance()
    val requestBuilder = okhttp3.Request.Builder()
      .addQueryParam("config_1", libOptions.getConfig1())
      .addQueryParam("config_2", libOptions.getConfig2())
      .addQueryParam("user_name", userName)
    
    return requestBuilder.build()
  }
}