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关于本章

保障描述string的常见操作的实现，这些常见操作伴随着我们的开发过程。

trim

What's the best way to trim std::string?

HOW TO TRIM A STD::STRING IN C++

char to string

https://stackoverflow.com/questions/1195675/convert-a-char-to-stdstring

https://www.techiedelight.com/convert-char-to-string-cpp/

https://www.geeksforgeeks.org/convert-character-array-to-string-in-c/

c string to std::string

std::string  pchar_to_string(const char * pchar)
{
    if (NULL == pchar) return "";

    return std::string(pchar); 
}

C string operation 参考

对于C string，需要对它的常用算法进行总结，下面是可以参考的内容:

1) ext/misc/csv.c