All wroking fine, too tired to make tests, everything seems fine

src/main.cpp

@@ -1,7 +1,106 @@
+#include "queue.h"
+#include "utils.h"
 #include <cstdlib>
 #include <print>
 
+void menu(Queue<int> queue);
+
 int main(void) {
-    std::println("Hola");
+    Queue<int> queue = {};
+
+    menu(queue);
     return EXIT_SUCCESS;
 }
+
+void menu(Queue<int> queue) {
+    while (true) {
+        clear_screen();
+        std::println("---Queue Manager---");
+        std::println("1) Enqueue.");
+        std::println("2) Dequeue.");
+        std::println("3) Peek.");
+        std::println("4) Diplay.");
+        std::println("5) Exit.");
+        int choice;
+
+        if (!read_int("", &choice)) {
+            std::println("Invalid input.");
+            wait_enter();
+            continue;
+        }
+
+        clear_screen();
+        switch (choice) {
+            case 1: {
+                int input;
+
+                if (!read_int("Type the integer to enqueue:\n", &input)) {
+                    std::println("Invalid input.");
+                    wait_enter();
+                    continue;
+                }
+
+                if (queue.enqueue(input) == QueueErr::bad_alloc) {
+                    std::println("Program couldn't allocate memory for queue.");
+                    wait_enter();
+                    continue;
+                }
+
+                std::println("Integer {} was correclty enqueued.", input);
+                wait_enter();
+                break;
+                }
+            case 2: {
+                auto out = queue.dequeue();
+                if (!out.has_value() && out.error() == QueueErr::empty) {
+                    std::println("The queue is empty.");
+                    wait_enter();
+                    continue;
+                } else if (!out.has_value() && out.error() == QueueErr::bad_alloc) {
+                    std::println("Program couldn't allocate memory for queue");
+                    wait_enter();
+                    continue;
+                }
+
+                std::println("The element at the tail was {}.", out.value());
+                wait_enter();
+                break;
+            }
+            case 3: {
+                auto out = queue.peek();
+                if (!out.has_value() && out.error() == QueueErr::empty) {
+                    std::println("The queue is empty.");
+                    wait_enter();
+                    continue;
+                } else if (!out.has_value() && out.error() == QueueErr::bad_alloc) {
+                    std::println("Program couldn't allocate memory for queue");
+                    wait_enter();
+                    continue;
+                }
+
+                std::println("The element at the tail was {}.", out.value());
+                wait_enter();
+                break;
+
+                }
+            case 4: {
+                queue.print();
+                wait_enter();
+                break;
+                }
+            case 5: {
+                std::println("Goodbye :)");
+                wait_enter();
+                clear_screen();
+                exit(1);
+                }
+            default: {
+                std::println("Invalid option.");
+                wait_enter();
+                clear_screen();
+                break;
+                }
+
+        }
+    }
+}