Remove Duplicate Characters from a String

Code

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

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

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

Solving Approach