Remove Duplicate Characters from a String

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

void remove_duplicates(char *str) {
	//Your logic here
    // use 2 pointers
    bool hash[256] = {0};
    uint8_t write_idx = 0, read_idx = 0;

    while (str[read_idx] != '\0') {
        uint8_t ch = (uint8_t)str[read_idx];
        if (!hash[ch]) {
            str[write_idx] = str[read_idx];
            hash[ch] = 1;
            write_idx++;
        }
        read_idx++;
    }
    str[write_idx] = '\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;
}