(string-fill! string char)
sets every character of string to char.

> (define mystr "AM")
mystr
> (string-fill! mystr #\z)
#[undefined]
> mystr
"zzz"

(string-copy string)
returns a new copy of string.

(string-append string_1 string_2 ...)
makes a new string by appending its argument strings.

> (string-append "Beat" "AM")
"BeatAM"

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