Remove Duplicate Characters from a String

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

void remove_duplicates(char *str) {
	//Your logic here
    int len=0;
    int index=0;
    int i,j;
    //get length
    while(str[len] != '\0'){
        len++;
    }

    for(i=0;i<len;i++){
        for(j=0;j<len;j++){
            if(str[i] == str[j])
                break;
        }

        if(j == i)
            str[index++] = str[i];
    }

    str[index] = '\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;
}