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Find the last occurrence of a character within the string.
constexpr size_type rfind( value_type c, size_type pos = npos) const;
            Finds the last occurrence of c
            within the string starting before or at the index pos.
          
Linear.
            The index corrosponding to the last occurrence of c
            within {begin(),
            begin()
            + pos} if it exists, and npos otherwise.
          
| Name | Description | 
|---|---|
| 
                       | The character to search for. | 
| 
                       | 
                      The index to stop searching at. The default argument for this
                      parameter is  |