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// Move all ‘x’ to the end of the string.

// Time Complexity = O(n)

package Recursion;

public class MoveCharacter {

public static void moveAllX(String str, int idx, int count, String newStr){

if(idx == str.length()){

for(int i=0; i<count; i++){

newStr += 'x';

}

System.out.println(newStr);

return;

}

char currChar = str.charAt(idx);

if(currChar == 'x' || currChar == 'X'){

count ++;

moveAllX(str, idx+1, count, newStr);

} else{

newStr += currChar;

moveAllX(str, idx+1, count, newStr);

}

public static void main(String[] args) {

String str = "axbcXXd";

moveAllX(str, 0, 0, "");

}