* 1. If this fishIsSurroundedByRocks, DO NOTHING, and move on to the next fish.
* (This fish will not turn.)
*

* 2. If this fish''s direction is not equal to one of the codes UP, DOWN, LEFT, or
* RIGHT, then throw an IllegalFishDirectionException, passing this fish''s
* direction to the constructor.
*

* 3. Check whether or not this fish is about to hit a rock if it moves in it''s
* current direction. If it is about to hit a rock, call the fish''s
* setRandomDirection method. Repeat this step until the fish is no longer
* about to hit a rock. Do not make any EXTRA calls to setRandomDirection or
* you will fail our tests!
*/

public void turnFish() {

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