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Getting stuck ?!?

stuck!
[code lang=”java”]

* File: StoneMasonKarel.java
* ————————–
* The StoneMasonKarel subclass as it appears here does nothing.
* When you finish writing it, it should solve the "repair the quad"
* problem from Assignment 1. In addition to editing the program,
* you should be sure to edit this comment so that it no longer
* indicates that the program does nothing.
*/

import stanford.karel.*;

public class StoneMasonKarel extends SuperKarel {

public void run(){
while(frontIsClear()){
turnLeft();
movetowall();
keepmoving();
}
}

private void movetowall(){
while(frontIsClear()){
move();
}
}

private void keepmoving(){
if(notFacingEast()){
turnRight();
}
nextcolumn();
}

private void fixColumn(){
while(noBeepersPresent()){
putBeeper();
move();
}
backtostart();
}

private void nextcolumn(){
turnRight();
move();
turnLeft();
// turnLeft();
// move();
}

private void backtostart(){
turnAround();
movetowall();
turnAround();
}

private void check(){
while(noBeepersPresent()){
move();
}
//backtostart();
}
// private void fix(){
// if(beepersPresent()){
// //backtostart();
// fixColumn();

// turnAround();
// movetowall();
// }

// }

}

[/code]
how to iterate??

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