如何在Ruby中从上面的行中删除换行字符?

I have a string which has been split anytime that a single line goes over 69 characters. In order to process it, I would like to restore it to how it was pre-split. A split line always starts with a forward slash character on the second and subsequent lines, which needs to be kept. Is there a nice Ruby way to do this? I have a string which has been split anytime th