Here the code is going to return the return value of sprintf(), presumably "1" which really doesn't mean anything in the context of this code.
From the docs (sprintf):
sprintf FORMAT, LIST
Returns a string formatted by the usual "printf" conventions of the C library function "sprintf".
Please elaborate how sprintf might return "1", other than as sprintf "1", as sprintf "%d", 1 or sprintf "%s",1; and how that might be the case given the incriminated statement.
perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'
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