A character of a string is accessed by specifying the string and the index of the desired character.

(string-ref string i)
accesses the ith character of string. i must be in the range 0 to k - 1, where k is the length of the string.

(string-set! string i char)
sets the ith character of string to be char.

> (define str "Hook 'em!")
str

> (string-ref str 0)
#\H

> (string-set! str 3 #\p)
"Hoop 'em!"

> (string-length str)
9

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