#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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