Who is the main character in the story, Serpent's Rock, from the collection, Young Warriors: Stories of Strength?

Gulpilil, the story's main character, is a teenage boy who makes arrows and spearheads for his village. He is not trained as a warrior, but he is a brave boy who knows he must risk his life to save his sister. Gulpilil lives in the Australian Outback. He travels to Serpent's Rock to destroy a beast that has killed everyone in his sister's village. Gulpilil works with the animals he meets along the way and earns the trust of the Great Serpent. He wins against the beast and goes to find his sister.