public static String nullToEmpty(@Nullable String string) {
    return Platform.nullToEmpty(string);
  }

  /**
   * Returns the given string if it is nonempty; {@code null} otherwise.
   *
   * @param string the string to test and possibly return
   * @return {@code string} itself if it is nonempty; {@code null} if it is empty or null
   */
  public static @Nullable String emptyToNull(@Nullable String string) {

    assertSame("xx", Strings.padStart("xx", 0, '-'));
    assertSame("xx", Strings.padStart("xx", 2, '-'));
  }

  public void testPadStart_somePadding() {
    assertEquals("-", Strings.padStart("", 1, '-'));
    assertEquals("--", Strings.padStart("", 2, '-'));
    assertEquals("-x", Strings.padStart("x", 2, '-'));
    assertEquals("--x", Strings.padStart("x", 3, '-'));

import jcifs.RuntimeCIFSException;

/**
 * Comprehensive test suite for Strings utility class.
 * Tests all string encoding/decoding operations and utility methods.
 */
@DisplayName("Strings Utility Tests")
class StringsTest {

    private static final String TEST_STRING = "Hello World";
    private static final String UNICODE_STRING = "Hello 世界 🌍";
    private static final String ASCII_STRING = "ASCII Test";

    @Nested

func canonicalizedAmzHeadersV2(headers http.Header) string {
	var keys []string
	keyval := make(map[string]string, len(headers))
	for key := range headers {
		lkey := strings.ToLower(key)
		if !strings.HasPrefix(lkey, "x-amz-") {
			continue
		}
		keys = append(keys, lkey)
		keyval[lkey] = strings.Join(headers[key], ",")
	}
	sort.Strings(keys)
	var canonicalHeaders []string
	for _, key := range keys {

		}
	}
}

var wordScanTests = []string{
	"",
	" ",
	"\n",
	"a",
	" a ",
	"abc def",
	" abc def ",
	" abc\tdef\nghi\rjkl\fmno\vpqr\u0085stu\u00a0\n",
}

// Test that the word splitter returns the same data as strings.Fields.
func TestScanWords(t *testing.T) {
	for n, test := range wordScanTests {
		buf := strings.NewReader(test)
		s := NewScanner(buf)
		s.Split(ScanWords)

					}
					continue
				}
				meta.name = strings.TrimSuffix(entry, xlStorageFormatFileV1)
				meta.name = strings.TrimSuffix(meta.name, SlashSeparator)
				meta.name = pathJoinBuf(sb, current, meta.name)

				return send(meta)
			}
			// Skip all other files.
		}

		// Process in sort order.
		sort.Strings(entries)
		dirStack := make([]string, 0, 5)

		t.Errorf("asm: %s assembly failed", goarch)
		return
	}
	output := strings.Split(testOut.String(), "\n")

	// Reconstruct expected output by independently "parsing" the input.
	data, err := os.ReadFile(input)
	if err != nil {
		t.Error(err)
		return
	}
	lineno := 0
	seq := 0
	hexByLine := map[string]string{}
	lines := strings.SplitAfter(string(data), "\n")
Diff:
	for _, line := range lines {
		lineno++

						int64(1e10 - blockSize),
						strings.Repeat("\x00", blockSize-100) + strings.Repeat("0123456789", 10),
						int64(1e10 - blockSize),
						strings.Repeat("\x00", blockSize-100) + strings.Repeat("0123456789", 10),
						int64(1e10 - blockSize),
						strings.Repeat("\x00", blockSize-100) + strings.Repeat("0123456789", 10),
						int64(1e10 - blockSize),

func extractMetadataFromReq(ctx context.Context, r *http.Request) (metadata map[string]string, err error) {
	return extractMetadata(ctx, textproto.MIMEHeader(r.Form), textproto.MIMEHeader(r.Header))
}

func extractMetadata(ctx context.Context, mimesHeader ...textproto.MIMEHeader) (metadata map[string]string, err error) {
	metadata = make(map[string]string)

	for _, hdr := range mimesHeader {
		// Extract all query values.

    String[] strings = NUMBER_NAMES.toArray(new String[0]);
    ImmutableSortedSet<String> set = ImmutableSortedSet.copyOf(strings);
    sort(strings);
    for (int i = 0; i < strings.length; i++) {
      assertThat(set.tailSet(strings[i], true))
          .containsExactlyElementsIn(sortedNumberNames(i, strings.length))
          .inOrder();
    }
  }

  public void testTailSetExclusive() {