Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	//Your logic here
    char dup[128] = {0};
    int i = 0,j = 0;
    while(str[j] != '\0'){
        if(dup[str[j]] == 0){
            str[i] = str[j];
            i++;
            dup[str[j]] += 1;
        }
        j++;
    }
    str[i] = '\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