C++ const char *转string 和 string 转const char *的一种方法

(认知有限，如有不妥，还请告知，欢迎讨论)

输出结果：

The type of "sample pkc" is PKc

The type of "sample str" is NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE

The type of "beginning pkc" is PKc

The type of "beginning pkc" now is NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE

The type of "beginning string" is NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE

The type of "beginning string" now is PKc

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