refactor: simplify variable naming

Rename the variable name of the class-wide `RoleApplicationSystemConfig`
to `config` and the variable name of `RoleApplicationHandler` to
`handler`, more simple and recognizable names. The original ones are too
verbose and unnecessarily yield long horizontal lines of code where
unnecessary.

These verbose names do work but only in the situation where there are
multiple configurations or handlers used in the same class.

Suggested-by: Zabuzard <zabuza.dev@gmail.com>
Signed-off-by: Chris Sdogkos <work@chris-sdogkos.com>

Author: christolis

application/src/main/java/org/togetherjava/tjbot/features/roleapplication/CreateRoleApplicationCommand.java

@@ -50,8 +50,8 @@ public class CreateRoleApplicationCommand extends SlashCommandAdapter {
     private static final int MINIMUM_ANSWER_LENGTH = 50;
     private static final int MAXIMUM_ANSWER_LENGTH = 500;
 
-    private final RoleApplicationHandler roleApplicationHandler;
-    private final RoleApplicationSystemConfig roleApplicationSystemConfig;
+    private final RoleApplicationHandler handler;
+    private final RoleApplicationSystemConfig config;
 
     /**
      * Constructs a new {@link CreateRoleApplicationCommand} with the specified configuration.
@@ -64,10 +64,10 @@ public CreateRoleApplicationCommand(Config config) {
         super("application-form", "Generates an application form for members to apply for roles.",
                 CommandVisibility.GUILD);
 
-        this.roleApplicationSystemConfig = config.getRoleApplicationSystemConfig();
+        this.config = config.getRoleApplicationSystemConfig();
 
         generateRoleOptions(getData());
-        roleApplicationHandler = new RoleApplicationHandler(roleApplicationSystemConfig);
+        handler = new RoleApplicationHandler(this.config);
     }
 
     /**
@@ -122,7 +122,7 @@ public void onStringSelectSelection(StringSelectInteractionEvent event, List<Str
             return;
         }
 
-        long remainingMinutes = roleApplicationHandler.getMemberCooldownMinutes(member);
+        long remainingMinutes = handler.getMemberCooldownMinutes(member);
         String correctMinutesWord = selectWordFromCount(remainingMinutes, "minute", "minutes");
 
         if (remainingMinutes > 0) {
@@ -135,8 +135,8 @@ public void onStringSelectSelection(StringSelectInteractionEvent event, List<Str
         }
 
         TextInput body = TextInput
-            .create(generateComponentId(event.getUser().getId()),
-                    roleApplicationSystemConfig.defaultQuestion(), TextInputStyle.PARAGRAPH)
+            .create(generateComponentId(event.getUser().getId()), config.defaultQuestion(),
+                    TextInputStyle.PARAGRAPH)
             .setRequired(true)
             .setRequiredRange(MINIMUM_ANSWER_LENGTH, MAXIMUM_ANSWER_LENGTH)
             .setPlaceholder("Enter your answer here")
@@ -270,7 +270,7 @@ private static MessageEmbed createApplicationEmbed() {
     }
 
     public RoleApplicationHandler getApplicationApplyHandler() {
-        return roleApplicationHandler;
+        return handler;
     }
 
     @Override