Remove Duplicate Characters from a String

Code

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

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

    for (int i = 0; i < len -1; i++)
    {
        for (int j = i+1; j < len; j++)
        {
            if(*(str + i)  == *(str + j))
            {
                for (int k = j; k < len - 1; k++)
                {
                    *(str + k) = *(str + k + 1);
                }
                len --;
            }
        }
    }

    *(str + len) = '\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;
}

Solving Approach