Answer / umesh

#include <stdio.h>
void fastSwap (char **k, char **l)
{
char *t = *k;
*k = *l;
*l = t;
}
int main ()
{
char num1[] = "abc";
char num2[] = "def";
fastSwap ((char**)&num1,(char**)&num2);
printf ("%s\n",num1);
printf ("%s\n",num2);
return 0;
}

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