I don't have a leopard but if it's an adult you can feed it alfalfa hay mixed with some leafy greens such as a spring mix, romaine lettuce, or dandelion greens and occasionally topped with calcium powder and vitamin D3. If it's a baby try some leafy greens and mix alfalfa in as it gets older. Also I give my baby sulcata some soaked mazuri tortoise diet and zoo med grassland tortoise diet. They both come from similar regions in Africa. Make sure you incorporate vitamins to. Also try hibiscus flowers.
Hopefully you have done some research on this already, but if you need mor einformation, do a search for Tom's threads on Leopard and Sulcata torts.
You should be feeding a base diet of greens like lettuces, weeds, grasses. Also add some variety like cactus, flowers, plant leaves. Some people add calcium powder or vitamins also. You should also add Mazuri tortoise food a few times a week. Make sure you have the right temperatures and sunlight so they can properly digest the food too.