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Toy Hash Review

Review the toy hash() function from the last assignment:

func hash(input []byte) [4]byte {
	for i, b := range input {
		rotated := bits.RotateLeft8(uint8(b), 3)
		input[i] = byte(rotated)
	}

	for i, b := range input {
		shifted := b << 2
		input[i] = byte(shifted)
	}

	final := [4]byte{}
	for i, b := range input {
		final[i%len(final)] ^= b
	}

	return final
}