[plt-scheme] Characters in a String

Hey there,

Is there a way to split apart a string into its individual characters? Sort
of like doing the reverse of make-string. The thing is, the string can be an
arbitrary number of characters so I can't really use substring. I'm trying
to find the spaces in a string and divide the string up into individual
words (which I can do with substring once I know which characters are
spaces). I need the characters either in a list together or just a way to
extract each character individually in a recursive program (sort of like
first and rest with lists).

Thanks,
Connor