The question is to shift x at last i am getting a segmentation error

#1 
#include<bits/stdc++.h>
using namespace std;

string XatLast(string str)
{
	if(str.size() == 0)
	{
		return "";
	}

	if(str[0] == 'x')
	{
		return XatLast(str.substr(1) + string("x"));
	}

	return XatLast(str[0] + str.substr(1));
}

int main()
{
	string str;
	cin >> str;
	cout << XatLast(str);
}
#2

this is not correct approach

try to dry run this approach
you will get your mistake

lets take an example xxabc;
if str[0] is x then you are calling for the string xabcx;
then you call for abcxx;
now after that you are repeatedly calling for abcxx
size of string never become 0

#3

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