Deliminator in finalcode of mystrtok function

why did he change the deliminator from " " to ’ ’ in the end when he use his function?

Hey @tusharnitharwal
The earlier unchanged code was for the inbuilt string tokenizer, this function accepts second argument(i.e. the delimiter argument) as a string, that is you can pass more than one character (a string) about which you want the main string to be split. The function mystrtok he has written in this video has been written with second parameter as a single character and not a string, for this function, you can pass only one character as a delimiter and hence string can be split only about one character.