todo/src/main/java/ru/kamask/pet/todo/cli/CliEngine.java

@@ -46,6 +46,7 @@ public class CliEngine {
         registerCommand(new CreateCommand());
         registerCommand(new ListCommand());
         registerCommand(new CompleteCommand());
+        registerCommand(new DeleteCommand());
     }
 
     void handleHelp() {

todo/src/main/java/ru/kamask/pet/todo/cli/DeleteCommand.java

@@ -0,0 +1,35 @@
+package ru.kamask.pet.todo.cli;
+
+import java.util.Optional;
+
+import ru.kamask.pet.todo.service.TaskService;
+
+public class DeleteCommand implements Command {
+    @Override
+    public String name() {
+        return "delete";
+    }
+
+    @Override
+    public String usage() {
+        return String.format(Command.templateUsage, name() + " <ID>", "Удалить задачу.");
+    }
+
+    @Override
+    public Optional<String> handle(String[] args, TaskService service) {
+        if (args.length != 1)
+            return Optional.of(Command.errorMessage);
+
+        try {
+            int id = Integer.parseInt(args[0]);
+            if (!service.has(id))
+                return Optional.of("Задача ID-%d не найдена.".formatted(id));
+            service.remove(id);
+            return Optional.of("Задача ID-%d удалена.".formatted(id));
+
+        } catch (NumberFormatException e) {
+            return Optional.of("ID - должен быть числом.");
+        }
+    }
+
+}