feat(ex03): it works

ex03/main.cpp

@@ -0,0 +1,26 @@
+#include "HumanA.hpp"
+#include "HumanB.hpp"
+#include "Weapon.hpp"
+
+int main() {
+  {
+    Weapon club = Weapon("crude spiked club");
+    HumanA bob("Bob", club);
+    bob.attack();
+    club.setType("some other type of club");
+    bob.attack();
+  }
+  {
+    Weapon club = Weapon("crude spiked club");
+    HumanB jim("Jim");
+    jim.setWeapon(club);
+    jim.attack();
+    club.setType("some other type of club");
+    jim.attack();
+  }
+  {
+    HumanB john("John");
+    john.attack();
+  }
+  return 0;
+}