9mm_ammo

1. metal plus metal. makes 1 sharpened_metal. 9mm_ammo required 2 sharpened_metal.
2. sharpened_metal plus hammer. makes 1 broken_ammo. note! multiple t required.
3. remaining sharpened_metal plus stone. makes 1 sharpened_stone.
4. sharpened_stone plus broken_ammo. makes 1 9mm_ammo. multiple t required.