Remove Duplicate Characters from a String

Code

#include <stdio.h>
#include <stdint.h>

void remove_duplicates(char *str) {
	//Your logic here
    char hash[256] = {0};
    int i = 0;
    int n = 0;
    while(str[i]!='\0')
    {
        uint8_t id = (uint8_t)str[i];
        if(!hash[id])
        {
            hash[id] = 1;
            str[n] = str[i];
            n++;
        }
        i++;
    }
    str[n] = '\0';
}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    uint8_t i = 0;
    while (str[i]) {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    remove_duplicates(str);
    printf("%s", str);
    return 0;
}

Solving Approach