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Find the last occurrence of a string within the string.
constexpr size_type rfind( const_pointer s, size_type pos, size_type n) const;
            Finds the last occurrence of the string pointed to by s
            within the string starting before or at the index pos.
          
Linear.
            The highest index idx
            less than or equal to pos
            where each element of {s, s + n)
            is equal to that of {begin() + idx, begin() + idx + n) if one exists, and npos otherwise.
          
| Name | Description | 
|---|---|
| 
                       | The string to search for. | 
| 
                       | The index to start searching at. | 
| 
                       | The length of the string to search for. |