class Solution {
public String removeDuplicates(String s) {
Stack<Character> stack = new Stack<>();
char arr[] = s.toCharArray();
for(char ch : arr){
if(!stack.isEmpty()){
if(stack.peek()==ch)
stack.pop();
else
stack.push(ch);
}
else
stack.push(ch);
}
String res = "";
StringBuilder sb = new StringBuilder();
while(!stack.isEmpty()){
sb.append(stack.pop());
}
return sb.reverse().toString();
}
}
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