Remove Duplicate Characters from a String

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

void remove_duplicates(char *str) {
	//Your logic here
   bool seen[256] = {false};
    int write_idx = 0;
    
    for (int read_idx = 0; str[read_idx] != '\0'; read_idx++) {
        unsigned char c = str[read_idx];
        
        if (!seen[c]) {
            seen[c] = true;
            str[write_idx++] = str[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;
}