Remove Duplicate Characters from a String

Code

#include <stdio.h>
#include <stdint.h>
void remove_duplicates(char *str) {
	//Your logic here
    int index = 0;
    while (str[index] != '\0'){
        index++;
    }
    for (int i = 0; i < index - 1; i++){
        for (int j = i + 1 ; j < index; j++){
            if(str[i] == str[j]){
                for(int k = 0; k < index - j;k++){
                    str[j + k] = str[j+k+1];
                }
            }
        }
    }
}

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