Answer Posted / prakashdasari

char *str1,*str2,*res;
while(*str1!=NULL)
str++;
while(*str2!=NULL)
{
*str1 == *str2;
str1++;
str2++;
}
*str1 = '\0';
//so total string is in one string ie str1 itself;
//now i will remove duplicates from entire string
for(i=0;str[i]!=NULL;i++)
{
for(j=0;str[j]!=NULL;j++)
{
if(str[i]==str[j])
{
flag = 1;break;
}
else flag = 0;
}
if(flag == 0)
{
*res = str[i];
res++;
}
*res = '\0';
}
now resultant string (res) is union of two character
arrays....

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