add overloaded string to num function
添加字符串转换为数字函数

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
rename stringprintf function
重命名stringprintf函数

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
add Guid format string
添加Guid格式化字符串

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
add function object defined
添加函数对象定义

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
fix tolower and mkdir
修正tolower和mkdir

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
add Guid_tostring and string_toGUID function
添加Guid_tostring和string_toGUID函数

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
change namespace setting
修改命名空间设置

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
optimization coding
优化代码

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>