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Rest toolkit utils project for Spring Boot

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package io.github.nichetoolkit.rest.util;

/**
 * CommonUtils
 * The common utils class.
 * @author Cyan ([email protected])
 * @since Jdk1.8
 */
public class CommonUtils {

    /**
     * substring
     * The substring method.
     * @param content {@link java.lang.String} The content parameter is String type.
     * @param limit   {@link java.lang.Integer} The limit parameter is Integer type.
     * @return {@link java.lang.String} The substring return object is String type.
     * @see java.lang.String
     * @see java.lang.Integer
     */
    public static String substring(String content, Integer limit) {
        if (GeneralUtils.isEmpty(content)) {
            return null;
        }
        String result;
        String contentTrim = content.replaceAll("\r", "")
                .replaceAll("\n", "")
//                .replaceAll(" ", "")
                .trim();
        if (contentTrim.length() > limit) {
            result = contentTrim.substring(0, limit).concat("...");
        } else {
            result = contentTrim;
        }
        return result;
    }
}