add spotify feature

src/main/java/cc/fascinated/bat/common/StringUtils.java

@@ -0,0 +1,20 @@
+package cc.fascinated.bat.common;
+
+/**
+ * @author Fascinated (fascinated7)
+ */
+public class StringUtils {
+    /**
+     * Generates a random string
+     *
+     * @param length the length of the string
+     * @return the random string
+     */
+    public static String randomString(int length) {
+        StringBuilder stringBuilder = new StringBuilder();
+        for (int i = 0; i < length; i++) {
+            stringBuilder.append((char) (Math.random() * 26 + 'a'));
+        }
+        return stringBuilder.toString();
+    }
+}