(string-read-quad! string) -> integer or #f
Destructively reads a byte "word" from the given string. If the string is empty, or does not contain a full quad, #f is returned, and the string is not altered.
Examples:
>> (define a "abcdefghijklmnopqrstuvwxyz") :: "abcdefghijklmnopqrstuvwxyz" >> (string-read-quad! a) :: 1633837924
>> (define b "1") :: "1" >> (string-read-quad! b) :: #f >> b :: "1"