Potential fix for code scanning alert no. 3: Clear-text logging of sensitive information

[SupravoCoder]

Potential fix for https://github.com/SupravoCoder/Bhukamp/security/code-scanning/3

To fix the problem, the logging statement should redact or mask the sensitive information (phone number) before logging it. For example, the phone number can be partially masked (e.g., showing only the last 4 digits) to preserve some context while maintaining privacy. The fix involves modifying the logging statement on line 145 to mask the phone number.

Steps to implement the fix:

1. Introduce a helper function to mask sensitive data like phone numbers.
2. Replace the logging statement to use the masking function.
3. Avoid altering the rest of the existing functionality.

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