Remove Duplicate Characters from a String

Code

#include <stdio.h>
#include <stdint.h>
#include <string.h>
void remove_duplicates(char *str) {
    uint8_t hash[256] = {0};  
    uint8_t read = 0, write = 0;

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