Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	//Your logic here
    uint8_t hash[256] = {0};
    uint8_t i = 0, j = 0;

    while(*(str+i)){
        uint8_t c = (uint8_t)*(str+i);
        if(hash[c]==0){
            hash[c] = 1;
            *(str+j) = *(str+i);
            j++;
        }
        i++;
    }
    *(str+j) = '\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