There is nothing to cure the wound. If the tree is fairly healthy it should close over the wounds and be fine in time as long as some type of canker disease doesn't infect the wound area. I suggest you create a cylinder of hardware cloth wire wrapped around the trunk very loosely to encourage your feline vandal to do its claw sharpening elsewhere. The fact that mulch area beneath your citrus tree has been selected as the preferred privy for cat is not a big concern. You could put some of the same wire or even chicken wire on the ground in that area. If kitty can't scratch it probably won't potty there.
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