Find Duplicate Char

Write a function that determines whether any character in a null-terminated character array is a duplicate (a repeated character) and returns the index of the first duplicate character to the caller. If the array contains no duplicate characters the function should return -1. Assume that there may be garbage at the end of the array.

  • call the function findDuplicateChar
  • must return -1 for c-strings like "are", "theory", "Erez", "Morag", and "UB40" (all unique characters)
  • for example, would return 3 for "area", return 7 for "Erez Morag", and return 2 for "bookkeeping"
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