code: public static String endWithNewLine(String sdpDescription) {
          if (sdpDescription == null || sdpDescription.isEmpty()) {
              throw new IllegalArgumentException("The SDP description cannot be null or empty");
          }
          return sdpDescription.trim().concat("\n");
      }
docs: Patches an SDP description by trimming and making sure it ends with a new line.
  
  @param sdpDescription The SDP description to be patched.
  @return The patched SDP description
  @author hrosa