public static String toPascalCase(String str) {
        return toCamelCase(str, true, '_', '-', ' ');
    }
<p>Converts all words separated by " ", "-", and "_" to CamelCase.</p>

<p>PacalCase is just like CamelCase, except the first character is an
uppercase letter.</p>

@param str  the String to be converted to PascalCase, may be null
@return camelCase of String, <code>null</code> if null String input
smithy-utils/src/main/java/software/amazon/smithy/utils/CaseUtils.java