C implementation:
#include <stdio.h>
int main()
{
char arr[100]="ash ;alsdfasf jahfjkjfhsakfjha";
int i;
int table[256] = {0};
int a;
for(i = 0; i<=10; i++)
{
// 'a ' store the ASCII value of arr[i]
a = arr[i];
if (table[a] == 0)
{
table[a] = 1;
printf("%c", arr[i]);
}
}
printf("/n");
}
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