Remove Duplicate Characters from a String

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

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