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Return a substring.
constexpr basic_static_string substr( size_type pos = 0, size_type count = npos) const;
Returns a substring of the string.
Strong guarantee.
          A string object containing the characters {data()
          + pos, std::min(count, size()
          - pos)) .
        
| Name | Description | 
|---|---|
| 
                     | 
                    The index to being the substring at. The default arugment for
                    this parameter is  | 
| 
                     | 
                    The length of the substring. The default arugment for this parameter
                    is  | 
| Type | Thrown On | 
|---|---|
| 
                     | 
                    pos >  |