如何解析输入字符串并将其以规范化格式打印出来？(Java)

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringParser {
    public static void main(String[] args) {
        String input = "Hello, World! This is a test string.";
        String normalizedString = normalizeString(input);
        System.out.println(normalizedString);
    }

    public static String normalizeString(String input) {
        // 去除字符串中的标点符号和多余空格
        String normalizedString = input.replaceAll("[^a-zA-Z0-9\\s]", "").replaceAll("\\s+", " ");

        // 将字符串转换为小写
        normalizedString = normalizedString.toLowerCase();

        // 将字符串按单词分割
        String[] words = normalizedString.split(" ");

        // 将每个单词的首字母大写
        StringBuilder sb = new StringBuilder();
        for (String word : words) {
            sb.append(Character.toUpperCase(word.charAt(0))).append(word.substring(1)).append(" ");
        }

        return sb.toString().trim();
    }
}