fixed file extension

[xiaobfly]

google::SetLogFilenameExtension(".log");

before:
Test.log20210401-161508.34056

after:
Test20210401-161508.34056.log

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[xiaobfly]

@googlebot I signed it!

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[xiaobfly]

@googlebot I fix

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We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[aesophor]

If the user has set a filename_extension for the log files, then the log cleaner will be broken because the filename format has been changed.

glog/src/logging.cc

Lines 1375 to 1432 in e51790b

	bool LogCleaner::IsLogFromCurrentProject(const string& filepath,
	const string& base_filename,
	const string& filename_extension) const {
	// We should remove duplicated delimiters from `base_filename`, e.g.,
	// before: "/tmp//<base_filename>.<create_time>.<pid>"
	// after: "/tmp/<base_filename>.<create_time>.<pid>"
	string cleaned_base_filename;
	for (size_t i = 0; i < base_filename.size(); ++i) {
	const char& c = base_filename[i];
	if (cleaned_base_filename.empty()) {
	cleaned_base_filename += c;
	} else if (c != dir_delim_ ||
	c != cleaned_base_filename.at(cleaned_base_filename.size() - 1)) {
	cleaned_base_filename += c;
	}
	}
	// Return early if the filename doesn't start with `cleaned_base_filename`.
	if (filepath.find(cleaned_base_filename) != 0) {
	return false;
	}
	// Check if in the string `filename_extension` is right next to
	// `cleaned_base_filename` in `filepath` if the user
	// has set a custom filename extension.
	if (!filename_extension.empty()) {
	if (filepath.find(filename_extension) != cleaned_base_filename.size()) {
	return false;
	}
	cleaned_base_filename += filename_extension;
	}
	// The characters after `cleaned_base_filename` should match the format:
	// YYYYMMDD-HHMMSS.pid
	for (size_t i = cleaned_base_filename.size(); i < filepath.size(); i++) {
	const char& c = filepath[i];
	if (i <= cleaned_base_filename.size() + 7) { // 0 ~ 7 : YYYYMMDD
	if (c < '0' || c > '9') { return false; }
	} else if (i == cleaned_base_filename.size() + 8) { // 8: -
	if (c != '-') { return false; }
	} else if (i <= cleaned_base_filename.size() + 14) { // 9 ~ 14: HHMMSS
	if (c < '0' || c > '9') { return false; }
	} else if (i == cleaned_base_filename.size() + 15) { // 15: .
	if (c != '.') { return false; }
	} else if (i >= cleaned_base_filename.size() + 16) { // 16+: pid
	if (c < '0' || c > '9') { return false; }
	}
	}
	return true;
	}

[xiaobfly]

IsLogFromCurrentProject

I will fix it.