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Call the REST Countries API to fetch information about a country by its name. Extract and return the country population as a Long value. Handle errors gracefully by returning null for invalid country names or failed API calls.

The API endpoint is: https://restcountries.com/v3.1/name/{countryName}?fields=population

The API returns a JSON array with country data. Use the first result from the array and extract the population field.

Examples:

Input: countryName = 'Germany' Output: 83240525 Explanation: Fetches Germany population from REST Countries API Input: countryName = 'Japan' Output: 125124989 Explanation: Fetches Japan population from REST Countries API Input: countryName = null Output: null Explanation: Returns null for null input Input: countryName = 'InvalidCountry' Output: null Explanation: Returns null for invalid country name (404 error)
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