code: public static String chopNewline(String str) {
          int lastIdx = str.length() - 1;
          if (lastIdx <= 0) {
              return EMPTY;
          }
          char last = str.charAt(lastIdx);
          if (last == CharUtils.LF) {
              if (str.charAt(lastIdx - 1) == CharUtils.CR) {
                  lastIdx--;
              }
          } else {
              lastIdx++;
          }
          return str.substring(0, lastIdx);
      }
docs: <p>Removes <code>\n</code> from end of a String if it's there.
  If a <code>\r</code> precedes it, then remove that too.</p>
  
  @param str  the String to chop a newline from, must not be null
  @return String without newline
  @throws NullPointerException if str is <code>null</code>
  @deprecated Use {@link #chomp(String)} instead.
  Method will be removed in Commons Lang 3.0.