Because of a weird task requirement, folders are not allowed

Who tf came up with this limitation? Seriously...

main.cpp

@@ -0,0 +1,86 @@
+#include <string>
+#include <iostream>
+
+#include <thread>
+#include <chrono>
+
+#include "world.hpp"
+#include "player.hpp"
+#include "blockRegistry.hpp"
+#include "movementHandler.hpp"
+#include "output.hpp"
+
+using std::string;
+using std::cout;
+using std::endl;
+
+bool startWorld(string worldFile);
+
+bool testMode = false;
+unsigned int worldIndex = 2;
+
+/**
+ * Entry point of the program.
+ * If a world file is provided as an argument, play through that world.
+ * Otherwise, play through all worlds in the worlds directory.
+ * In case the player dies during gameplay, exit without printing the victory screen.
+ * If the player reaches the goal of the final level, print the victory screen and exit.
+ */
+int main(int argc, char *argv[]) {
+    if (argc > 1) {
+        for (int i = 1; i < argc; i++) {
+            string arg = string(argv[i]);
+            if (arg == "-h" || arg == "--help") 
+                break;
+            else if (arg == "-t" || arg == "--test") 
+                testMode = true;
+            
+            else if ((arg == "-l" || arg == "--level") && argc > i + 1) {
+                if (!startWorld("./worlds/" + string(argv[i+1])))
+                    return 0; // Load only the specified world
+                else
+                    printFile("./completed_single_level.screen.txt", Color::BRIGHT_GREEN);
+                return 0;
+            }
+        }
+        if (!testMode) {
+            printFile("./help.screen.txt", Color::BRIGHT_BLUE); // Print help screen
+            return 0;
+        }
+    }
+    if (!testMode) {
+        printFile("./start.screen.txt", Color::BRIGHT_YELLOW);
+        waitForInput();
+        printGuide();
+        waitForInput();
+    }
+    
+    // Load every world in order
+    for (const auto & world : getOrderedFileNames("./", ".world.txt"))
+        if (!startWorld(world)) return 0;
+    // Print the victory screen once all levels have been completed
+    printFile("./victory.screen.txt", Color::BRIGHT_GREEN);
+
+    return 0;
+}
+
+/**
+ * Start a new world defined in the file at worldFile.
+ * If the player reaches the goal, return true.
+ * In case they die, print the death screen and return false.
+ * @return true if the player reached the goal, false in case of death
+ */
+bool startWorld(string worldFile) {
+    BlockRegistry blockRegistry = BlockRegistry();
+    World world = World(blockRegistry);
+    
+    world.loadFromFile(worldFile);
+    Player player = Player(world.getStartPos(), world);
+    render(world, player.mapToWorldspace());
+    
+    inputLoop(player, world, testMode, worldIndex);
+
+    worldIndex++;
+    if (!player.isAlive()) printFile("./death.screen.txt", Color::BRIGHT_RED);
+    return player.hasReachedGoal();
+}