Remove Duplicate Characters from a String

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

void remove_duplicates(char *str) {
	//Your logic here
    uint8_t check[256] = {0};   //mang luu gia tri ASCII
    uint8_t read = 0, write = 0;

    while (str[read] != '\0') {
        uint8_t c = (uint8_t)str[read];

        if (!check[c]) {        //kiem tra xem char da xuat hien hay chua
            check[c] = 1;       //chay if khi c = 0 (chua xuat hien)
            str[write++] = str[read];   //bo qua write = 0 vi no la phan tu dau tien => ko trung`
        }
        read++;           
    }
    str[write] = '\0';          //Ket thuc mang
}

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;
}