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lettersOnly

Language/Type: C++ recursion string return
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Write a recursive function named lettersOnly that accepts a string s as a parameter and returns a string with the same characters as s, in the same order, but excluding any characters that are not alphabetic letters from A-Z, case-insensitive. For example, the call of lettersOnly("{[[Friends, save $$$ with 'Geico'!!]]}") should return "FriendssavewithGeico". If the string passed is empty or contains no letters, return an empty string.

  • Do not use any loops; you must use recursion.
  • Do not call any of the following string member functions: find, rfind, indexOf, contains, replace, split. (The point of this problem is to solve it recursively; do not use a library function to get around recursion.)
  • Do not use any auxiliary data structures like vector, map, set, array, etc.
Function: Write a C++ function as described, not a complete program.

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