> + buffer.append(credentialScope).append("\n");
> + buffer.append(hashedCanonicalRequest);
> + return buffer.toString();
> + }
> +
> + private String formatDateWithoutTimestamp(String date) {
> + return date.substring(0, 8);
> + }
> +
> + private String buildCredentialScope(String dateWithoutTimeStamp) {
> + StringBuilder buffer = new StringBuilder();
> + buffer.append(dateWithoutTimeStamp).append("/");
> + buffer.append(REGION).append("/");
> + buffer.append(SERVICE).append("/");
> + buffer.append(TERMINATION_STRING);
> + return buffer.toString();
Reuse result of ```StringBuffer.append``` instead of using ```buffer``` local
variable.
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