how to write two strings in a file seperated by space or comma in c?

I am having two strings , I want to write these strings to a FILE in the following format:

string1 "space开发者_如何学Go/comma" string2 "newline"
string3 "space/comma" string4 "newline"
..
..
..

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FILE* fileptr = fopen("file.txt","wt");
fprintf(fileptr,"%s , %s \n",string1,string2);