In Scheme/ChezScheme, using a map with display causes to print void after the procedure finishes [duplicate]

I'm using chezscheme 9.5.8. I created the following function, which receives a string and prints a phrase using that string:

> (define (ijustlove str)
    (display
      (string-append "I just love "
                     (string-upcase str)
                     "!!!\n")))
> (ijustlove "bananas")
I just love BANANAS!!!

But, if I map the function over a list, it prints #<void> (Which is the same as doing (display (void)) ):

> (map ijustlove '("strawberries" "bananas" "grapes"))
I just love STRAWBERRIES!!!
I just love BANANAS!!!
I just love GRAPES!!!
(#<void> #<void> #<void>)

Is there any way to avoid this?

from In Scheme/ChezScheme, using a map with display causes to print void after the procedure finishes [duplicate]