Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	bool seen[256];

    for (int i = 0; i < 256; i++) {
        seen[i] = false;
    }

    int read = 0;
    int write = 0;
    while (str[read] != '\0') {
        if (seen[str[read]]) {
            read++;
            continue;
        }
        seen[str[read]] = true;
        str[write] = str[read];
        read++;
        write++;
    }
    str[write] = '\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;
}

Solving Approach