Improve various small code quality issues

src/main/java/wtf/beatrice/hidekobot/commands/message/AvatarCommand.java

@@ -70,6 +70,7 @@ public class AvatarCommand  implements MessageCommand
                 resFound = true;
                 break;
             } catch (NumberFormatException ignored) {
+                // ignored because we're running a check after this block
             }
         }
 

src/main/java/wtf/beatrice/hidekobot/commands/message/BannerCommand.java

@@ -70,6 +70,7 @@ public class BannerCommand implements MessageCommand
                 resFound = true;
                 break;
             } catch (NumberFormatException ignored) {
+                // ignored because we're running a check after this block
             }
         }
 

src/main/java/wtf/beatrice/hidekobot/commands/message/ClearCommand.java

@@ -52,8 +52,6 @@ public class ClearCommand implements MessageCommand
     @Override
     public void runCommand(MessageReceivedEvent event, String label, String[] args)
     {
-        String senderId = event.getMessage().getAuthor().getId();
-
         // check if user is trying to run command in dms.
         String error = ClearChat.checkDMs(event.getChannel());
         if (error != null) {

src/main/java/wtf/beatrice/hidekobot/commands/message/DiceRollCommand.java

@@ -33,13 +33,16 @@ public class DiceRollCommand implements MessageCommand
 
     @NotNull
     @Override
-    public String getDescription() {
-        return "Roll dice. You can roll multiple dice at the same time." +
-                "\nExamples:" +
-                "\n - `d8 10` to roll an 8-sided die 10 times." +
-                "\n - `d12 3 d5 10` to roll a 12-sided die 3 times, and then a 5-sided die 10 times." +
-                "\n - `30` to roll a standard 6-sided die 30 times." +
-                "\n - `d10` to roll a 10-sided die once.";
+    public String getDescription()
+    {
+        return """
+                Roll dice. You can roll multiple dice at the same time.
+                Examples:
+                 - `d8 10` to roll an 8-sided die 10 times.
+                 - `d12 3 d5 10` to roll a 12-sided die 3 times, and then a 5-sided die 10 times.
+                 - `30` to roll a standard 6-sided die 30 times.
+                 - `d10` to roll a 10-sided die once.
+                """;
     }
 
     @Nullable

src/main/java/wtf/beatrice/hidekobot/commands/message/HelpCommand.java

@@ -11,10 +11,7 @@ import wtf.beatrice.hidekobot.commands.base.Alias;
 import wtf.beatrice.hidekobot.objects.commands.CommandCategory;
 import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
 
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.LinkedList;
-import java.util.List;
+import java.util.*;
 
 public class HelpCommand implements MessageCommand
 {
@@ -82,10 +79,11 @@ public class HelpCommand implements MessageCommand
                             "\nYou will find a list of commands organized in categories below.",
                     false);
 
-            for(CommandCategory category : commandCategories.keySet())
+            for(Map.Entry<CommandCategory, LinkedList<MessageCommand>> entry : commandCategories.entrySet())
             {
                 StringBuilder commandsList = new StringBuilder();
-                LinkedList<MessageCommand> commandsOfThisCategory = commandCategories.get(category);
+                CommandCategory category = entry.getKey();
+                LinkedList<MessageCommand> commandsOfThisCategory = entry.getValue();
 
                 for(int pos = 0; pos < commandsOfThisCategory.size(); pos++)
                 {