code: public static void setCareOfPrefix (@Nonnull final String sCareOfPrefix)
    {
      ValueEnforcer.notNull (sCareOfPrefix, "CareOfPrefix");
      s_aRWLock.writeLocked ( () -> s_sCareOfPrefix = sCareOfPrefix);
    }
docs: Set the prefix to be added in front of "c/o" address line. By default it is
  "c/o ".
  
  @param sCareOfPrefix
  The c/o prefix. May not be <code>null</code> but maybe empty.