Heat up a cast-iron skillet, add the olive oil, garlic and lightly saute before adding the shrimp. Stir and cook until the shrimp is half cooked. Add the cilantro, butter, stir to combine well with the shrimp. Add the lime juice and continue to cook the shrimp. Turn off the heat when the lime juice dries up and the shrimp is nicely cooked and slightly charred on the surface. Serve immediately with some fresh lime wedges.