public class progprac {
public static void main(String[] args) {
String str="abbaca"; // o/p=ca
String res="";
for(int i=0;i<=str.length()-1;i++){
if(!res.contains(String.valueOf(str.charAt(i)))){
res=res+str.charAt(i);
}else{
res=res.replace(String.valueOf(str.charAt(i)),"");
}
}
System.out.println("result="+res);
}
}
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