C program to append a string to another string

#include <stdio.h>
#include <conio.h>
int main()
{
char Dest_Str[100], Source_Str[50];
int i=0, j=0;
clrscr();
printf("\n Enter the source string : ");
gets(Source_Str);
printf("\n Enter the destination string : ");
gets(Dest_Str);
while(Dest_Str[i] != '\0')
 i++;
while(Source_Str[j] != '\0')
{
Dest_Str[i] = Source_Str[j];
 i++;
j++;
}
Dest_Str[i] = '\0';
printf("\n After appending, the destination string is : ");
puts(Dest_Str);
getch();
return 0;
}