Write a recursive, int -valued function, len, that accepts a string and returns the number of characters in the string.

LANGUAGE: C++

CHALLENGE:

Write a recursive, int -valued  function, len, that accepts a string  and returns the number of characters  in the string .
The length of a string  is:
0 if the string  is the empty string  (“”).
1 more than the length of the rest of the string  beyond the first character.

SOLUTION:

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