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Find the last occurrence of a character within the string.
std::size_t rfind( char ch, std::size_t pos = npos) const;
            Returns index corrosponding to the last occurrence of ch
            within {begin(), begin() + pos}
            if it exists, and npos otherwise.
          
Linear.
            The last occurrence of ch
            within the string starting before or at the index pos,
            or npos
            if none exists.
          
| Name | Description | 
|---|---|
| 
                       | The character to search for. | 
| 
                       | 
                      The index to stop searching at. The default argument for this
                      parameter is  |