Removed 're: message_id'

Author: Joshix-1

src/main/java/org/javacord/bot/listeners/CommandCleanupListener.java

@@ -24,7 +24,8 @@ public class CommandCleanupListener implements MessageDeleteListener {
      * @return The embed builder for call chaining.
      */
     public static EmbedBuilder insertResponseTracker(EmbedBuilder builder, long trackedMessageId) {
-        return builder.setFooter("re: " + trackedMessageId);
+        return builder.setFooter(longToBinaryBlankString(trackedMessageId)
+                + "If you delete your invocation message, this response will be deleted.");
     }
 
     @Override
@@ -43,14 +44,19 @@ private Predicate<Message> isMessageAfter(Instant instant) {
     }
 
     private Predicate<Message> isOurResponseTo(long messageId) {
-        String tracker = "re: " + messageId;
+        String tracker = longToBinaryBlankString(messageId);
         return message -> !message.getEmbeds().isEmpty()
                 && message.getAuthor().isYourself()
                 && message.getEmbeds().get(0).getFooter()
                 .flatMap(EmbedFooter::getText)
-                .map(tracker::equals)
-                .orElse(false);
+                .filter(text -> text.startsWith(tracker))
+                .isPresent();
     }
 
-
+    private static String longToBinaryBlankString(long l)  {
+        return Long.toBinaryString(l)
+                .replace('0', '\u200B')
+                .replace('1', '\u200C')
+                + '\u200D';
+    }
 }