import java.util.LinkedHashSet;
import java.util.Set;
class Solution {
public String solution(String my_string) {
Set<Character> set = new LinkedHashSet<>();
for (int i = 0; i < my_string.length(); i++) {
set.add(my_string.charAt(i));
}
Character[] tempCharacterArr = set.toArray(new Character[0]);
StringBuilder sb = new StringBuilder();
for (Character character : tempCharacterArr) {
sb.append(character);
}
return sb.toString();
}
}