Remove Duplicate Characters from a String

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

void remove_duplicates(char *str) {
    int i = 0;

    while (str[i] != '\0') {
        int j = i + 1;

        while (str[j] != '\0') {
            if (str[i] == str[j]) {
                // shift left to remove duplicate
                int k = j;
                while (str[k] != '\0') {
                    str[k] = str[k + 1];
                    k++;
                }
            } else {
                j++;
            }
        }
        i++;
    }
}

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;
}