Teaching Assistant

Develop a function named `retrieveCityWeatherData` that retrieves weather information for a specified city by making use of an API returning a Promise. The function's specifications are as follows:

1. Take a city name as a string parameter.

2. Initiate an API request to acquire weather data for the specified city.

3. Upon a successful API response, fulfill the promise with the obtained weather details (such as temperature, humidity, and description).

4. In case of an unsuccessful API call, decline the promise and include an error message.

Restructure the current code, which retrieves data from these APIs through nested callbacks, by employing Promises. This approach aims to eliminate the problem of "Callback Hell."

Creating a JavaScript utility for file processing is your current endeavor. The objective involves crafting a function capable of asynchronously reading a file and executing operations on its contents through the utilization of callbacks.