Remove Duplicate Characters from a String

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

void remove_duplicates(char *str) {
	//Your logic here
    uint8_t hash[256] = {0};
    char *read = str;
    char *write = str;

    while (0 != *read) {
        uint8_t ch = (uint8_t)*read;
        if (0 == hash[ch]) {
            hash[ch] = 1;
            *write++ = *read;
        }
        read++;
    }
    *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;
}

It was a surprising idea.