This specifies a Turing machine that will write a blank in the first cell to the right that contains a 1.
Turing Machines in Karel J Robot are discussed at: http://csis.pace.edu/~bergin/KarelJava2ed/turingmachine.html

classpath: FitNesseRoot/files/JoeBergin/Fixtures/classes

kareltherobot.KarelFixture
kareltherobot.PickOneTM
World	reset
World	placeBeepers	1	5	1
Create	karel
Assert	BeepersInWorld	0
Assert	BeepersInBeeperBag	karel
Assert	NotRunning	karel

Here is the code for the class. Note that a TM robot automatically executes starting in state1 when you create it.

/*
 * Created on Oct 13, 2003
 *
 */
package kareltherobot;

import java.awt.Color;

/** A Turing Machine robot to write a blank in the first cell to the right
 * of the origin (inclusive) that originally has a 1. 
 * @author jbergin
 *
 */
public class PickOneTM extends TuringMachine
{
	public PickOneTM()
	{
		super();
	}

	public PickOneTM(Color badge)
	{
		super(badge);
	}

	public void state1()
	{       
		if(nextToABeeper())
		{       
			putBlank();
			finalState();
		}
		else
		{	moveRight();
			state1();
		}
	}
}

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