Scheme Exercises

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Group:     Exercise: 26/48 

numdigits:  Count the number of digits of a positive integer

Create the function "numdigits" that will be given a positive integer and will return the number of digits it has. For instance,
(numdigits 537) ; -> 3
(numdigits 4) ; -> 1
(numdigits 12345678987654321) ; -> 17