# include <stdio.h>
#include<conio.h>
#define concatinate(a,b) a##b
#define same1(a) #a
#define same2(a) same1(a)


int main(){
printf("%s\n",same2(concatinate(1,2)));
printf("%s\n",same1(concatinate(1,2)));
getch();
return 0;
}

Output is:
12
concatinate(1,2)

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