Swap Two Strings

/*
Write a program in C for Swapping Two Strings
*/

#include<stdio.h>
#include<string.h>
#include<malloc.h>
#include<conio.h>
main()
{
char first[100], second[100], *temp;
printf("Enter the first string ");
gets(first);
printf("Enter the second string ");
gets(second);
printf("\nBefore Swapping\n");
printf("First string: %s\n",first);
printf("Second string: %s\n\n",second);
temp = (char*)malloc(100);
strcpy(temp,first);
strcpy(first,second);
strcpy(second,temp);
printf("After Swapping\n");
printf("First string: %s\n",first);
printf("Second string: %s\n",second);
getch();
return 0;
}