Wrapper.java

public class Wrapper {
  public static String wrap(String s, int col) {
    if (s.length() <= col)
      return s;
    else {
      StringBuilder builder = new StringBuilder();
      String[] strings = s.split(" ");
      int column = 0;
      for (String segment : strings) {
        column += segment.length();
        if (column < col)
          builder.append(segment+" ");
        else
          builder.append(segment+"\n");
      }
      return builder.toString();
    }

//     return s.replaceAll(" ", "\n");
  }
}