This question runs in a pre-configured Salesforce environment - no personal connection required.

Fetch user details from DummyJSON API and enrich with country information from REST Countries API. This challenge involves making two HTTP calls - first to get user information, then to get country details based on the user's address.

The method should return a formatted string containing both user and country information, handling all API errors gracefully.

Examples:

Input: userId = 1 Output: "User: John Doe (john@example.com) from United States - Capital: Washington, D.C., Population: 331,900,000, Currency: USD" Explanation: Successfully fetched user data and country information, formatted as requested Input: userId = 999 Output: null Explanation: Invalid user ID returns null instead of throwing an error Input: userId = null Output: null Explanation: Null input returns null gracefully
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