Help !! Format method

Question

I wrote a method for a format tool which adjusts the indentation according to Java rules. The first line has zero indentation (leading spaces are removed, if necessary). Indentation for subsequent lines is increased by four spaces for each open brace, '{', encountered, and decreased by four spaces for each close brace, '}'. Braces are not moved from one line to another; only indentation is adjusted.
It is possible for the indentation count to become negative. Lines with "negative indentation" should not, of course, be indented, but the count should be maintained so that subsequent lines can be indented correctly.
i messed up, how to fix it?
thanks
public String translate(String text) {
    StringBuilder s = new StringBuilder();
    s.append(text);
    StringBuilder newLines = new StringBuilder();
    for (int i = 0; i <= s.length(); i++) {
     newLines.append(text.charAt(i));
     if(s.charAt(i) == ' '&& s.indexOf(i)!= ' ') {
         s.delete(0, i-1);
        if (s.charAt(i)== '{') {
                    newLines.insert(i-1, "    ");
        if(text.charAt(i)== '}') {
            newLines.insert(i+1, "    ");
    return newLines.toString();
}

Answer 1

public String translate(String text) {
    StringBuilder s = new StringBuilder();
    s.append(text);
    StringBuilder newLines = new StringBuilder();
    String temp = "";
    //int counter = 0;
    for (int i = 0; i <= s.length(); i++) {
     newLines.append(text.charAt(i));
     if(s.charAt(i) == ' '&& s.charAt(i)!= ' ') {
         s.delete(0, i-1);
        if (s.charAt(i)== '{') {
          temp = s.substring(i-4,i-1);
          newLines.insert(i-1, "    ");
        if(text.charAt(i)== '}') {
            newLines.insert(i+1, "    ");
    return newLines.toString();
}