}

  private fun uppercase(original: RequestBody?): RequestBody =
    object : RequestBody() {
      override fun contentType(): MediaType? = original!!.contentType()

      override fun contentLength(): Long = original!!.contentLength()

      override fun writeTo(sink: BufferedSink) {
        val uppercase = uppercase(sink)
        val bufferedSink = uppercase.buffer()
        original!!.writeTo(bufferedSink)

        assertTrue(CharUtil.isUrlChar('a')); // first lowercase
        assertTrue(CharUtil.isUrlChar('z')); // last lowercase
        assertTrue(CharUtil.isUrlChar('A')); // first uppercase
        assertTrue(CharUtil.isUrlChar('Z')); // last uppercase
        assertTrue(CharUtil.isUrlChar('0')); // first digit
        assertTrue(CharUtil.isUrlChar('9')); // last digit

        // Test characters just outside ranges that are not valid

    @LazyInit private volatile @Nullable BaseEncoding upperCase;
    @LazyInit private volatile @Nullable BaseEncoding lowerCase;
    @LazyInit private volatile @Nullable BaseEncoding ignoreCase;

    @Override
    public BaseEncoding upperCase() {
      BaseEncoding result = upperCase;
      if (result == null) {
        Alphabet upper = alphabet.upperCase();

				<c:if
					test="${fieldData.name == 'label' && fieldData.valueCountMap.size() > 0}">
					<ul class="list-group mb-2">
						<li class="list-group-item text-uppercase"><la:message
								key="labels.facet_label_title" /></li>
						<c:forEach var="countEntry" items="${fieldData.valueCountMap}">
							<c:if
								test="${countEntry.value != 0 && fe:labelexists(countEntry.key)}">

     */
    private CharUtil() {
    }

    /**
     * Checks if the given character is a valid URL character.
     *
     * Valid URL characters include:
     * - Lowercase letters (a-z)
     * - Uppercase letters (A-Z)
     * - Digits (0-9)
     * - Special characters: . - * _ : / + % = & ? # [ ] @ ~ ! $ ' ( ) , ;
     *
     * @param c the character to check

            return text.substring(prefix.length());
        }
        return text;
    }

    /**
     * Decapitalizes a string according to JavaBeans conventions.
     * Note: If the first two characters are uppercase, the string will not be decapitalized.
     * <p>
     * Usage example:
     * </p>
     *
     * <pre>
     * StringUtil.decapitalize("UserId")  = "userId"
     * StringUtil.decapitalize("ABC")     = "ABC"