C语言创建文件夹
参考
https://linux.die.net/man/3/mkdir Creating a Directory
https://www.cnblogs.com/TTTTT/p/6017691.html
参考Gipuma代码:https://github.com/kysucix/gipuma/blob/master/main.cpp#L25-L26
C++中可以使用第三方库boost:https://github.com/colmap/colmap/blob/master/src/util/misc.cc#L97