public function possessive()
        {
            $string = $this->get();
            $value = $string."'".(
                's' !== substr($string, -1)
                    ? 's'
                    : null
                );
            $this->update($value);
            return $this;
        }
public function possessive()
        {
            $string = $this->get();
            $value = $string."'".(
                's' !== substr($string, -1)
                    ? 's'
                    : null
                );
            $this->update($value);
            return $this;
        }
public function possessive ( ) { $ string = $ this -> get ( ) ; $ value = $ string . "'" . ( 's' !== substr ( $ string , - 1 ) ? 's' : null ) ; $ this -> update ( $ value ) ; return $ this ; }
Get the possessive version of a string.

@return \PHY\Variable\Str
Get the possessive version of a string .