#include<string.h>
int main ()
{
char str[]="hello world";
int i,j=0,checker=0;
for(i=0;i<strlen(str);i++)
{
int val=str[i]-'a';
if ((checker&(1<<val))<=0)
str[j++]=str[i];
checker|=(1<<val);
}
str[j]='\0';
printf("%s",str);
return 0;
}
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