[Fix] - Avoid logging sensitive key material in examples

[mrz1836]

This pull request improves the security of the example code and documentation for wallet and HD key generation by avoiding the exposure of sensitive key material. Instead of printing or logging raw private or public keys, the code now logs only short fingerprints derived from the public keys. The documentation is updated to reflect these best practices.

Security improvements in key handling:

• In both create_wallet.go and generate_hd_key.go, added logic to compute and log only a fingerprint (first 8 bytes of a SHA-256 hash) of the public key or xPub, instead of printing the full key material. This reduces the risk of accidental key exposure. [1] [2]

Documentation updates:

• Updated generate_hd_key/README.md to instruct users not to log raw keys, to use fingerprints for verification, and to clarify the importance of keeping private keys secure. The code walkthrough and output description were also revised to match the new fingerprinting approach. [1] [2] [3]

Dependency additions:

• Added the crypto/sha256 import to both example files to support fingerprint generation. [1] [2]

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docs/examples/create_wallet/create_wallet.go	0.00%	2 Missing ⚠️
docs/examples/generate_hd_key/generate_hd_key.go	0.00%	2 Missing ⚠️

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