修改合并mp3文件规则

src/main/java/com/mortals/xhx/tts/utils/SpliceMp3Util.java

@@ -109,7 +109,7 @@ public class SpliceMp3Util {
      */
     public static void saveToFile(InputStream inStream, File file) throws IOException {
         if (file.exists()) {
-            throw new IOException("File already exists");
+            file.delete();
         }
         try (OutputStream outStream = new FileOutputStream(file)) {
             byte[] buffer = new byte[4096];