Remove Duplicate Characters from a String

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

void remove_duplicates(char *str) {
	//Your logic here
    int visited[256]={0},index=0;
    for(int i=0;str[i] != '\0';i++){
        if(visited[(unsigned char)str[i]]==0){
            visited[(unsigned char)str[i]]=1;
            str[index++]=str[i];
        }
    }
    str[index]='\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;
}