Question: for Racket language Write a structurally recursive function (digit-sum n) that takes one argument, a non-negative integer n. Think of n in terms of its

for Racket language

Write a structurally recursive function (digit-sum n) that takes one argument, a non-negative integer n. Think of n in terms of its digits using the BNF description given above. digit-sum returns the sum of the digits in n. For example:

 > (digit-sum 1984) 22 > (digit-sum 47) 11 > (digit-sum (expt 18 6)) ; 34012224 18

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