Full Stack Engineer

Create a function fetchWeatherData(city) that fetches weather data for a given city using an API that returns a Promise. The function should:

1. Accept a city as a string parameter.
2. Make an API call to retrieve weather data for that city.
3. If the API call is successful, resolve the promise with the weather data (e.g., temperature, humidity, description).
4. If the API call fails, reject the promise with an error message.

Refactor an existing code that fetches data from these APIs using nested callbacks to use Promises instead, thus avoiding "Callback Hell."

You are developing a file processing utility in JavaScript. Your task is to implement a function that reads a file asynchronously and performs an operation on its contents using callbacks.

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