code: func ComputePrivateKey(mprivHex string, chainHex string, path string, index int32) string {
  	privKeyBytes := DerivePrivateKeyForPath(
  		HexDecode(mprivHex),
  		HexDecode(chainHex),
  		fmt.Sprintf("%v/%v", path, index),
  	)
  	return HexEncode(privKeyBytes)
  }
docs: // ComputePrivateKey returns the private key using the master mprivHex and chainCodeHex
  // for the given path and index.