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#include<stdio.h>
void main()
{
char s1[100]="hello ";
char s2[100]="world";
char s3[100];
int i,j,f,c=0,n=0;
for(i=0;s1[i]!='\0';i++)
{
n=0;
for(j=i+1;s1[j]!='\0';j++)
{
if(s1[i]==s1[j])
{
n++;
}
}
if(n==0)
{
s3[c]=s1[i];
c++;
}
}
for(i=0;s3[i]!='\0';i++)
{
f=0;
for(j=0;s2[j]!='\0';j++)
{
if(s2[j]==s3[i])
{
f++;
}
}
if(f>=1)
{
printf("%c",s3[i]);
}
}
}