I want to remove certain characters at specific positions of the String. I have the positions, but I am facing problems removing the characters.

what i am doing is:

```
if (string.subSequence(k, k + 4).equals("\n\t\t\t")){
    string = string.subSequence(0, k) + "" + s.subSequence(k, s.length());
}

```

I need to remove `"\n\t\t\t"` from string