code: public static String getDesc(final CtConstructor c)
  			throws NotFoundException {
  		StringBuilder ret = new StringBuilder("(");
  		CtClass[] parameterTypes = c.getParameterTypes();
  		for (int i = 0; i < parameterTypes.length; i++)
  			ret.append(getDesc(parameterTypes[i]));
  		ret.append(')').append('V');
  		return ret.toString();
  	}
docs: get constructor desc. "()V", "(Ljava/lang/String;I)V"
  
  @param c
  constructor.
  @return desc