Remove Duplicate Characters from a String

Code

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

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

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