fixed the generateContent() produces empty text output

[akhileshdasari2004]

Code Changes Summary:
Robust Response Validation:

Added optional chaining (?.) to safely check nested properties in the API response, preventing runtime errors if the response is empty or malformed.

Retry Mechanism:

Introduced a retry mechanism to handle transient issues (e.g., network errors or empty responses). The function retries the API call up to 3 times (configurable) to increase reliability.

Error Handling and Logging:

Added detailed error logging for each failed attempt, including the attempt number, error message, and full response (if available), making debugging easier.

Early Exit on Success:

The function exits early if a valid response is received, avoiding unnecessary retries and improving efficiency.

Code Structure:

Consolidated logic into a single function (getCapitalOfFranceWithRetry) for better readability and maintainability.

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