Remove Duplicate Characters from a String

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

void remove_duplicates(char *str) 
{
    uint8_t hash[256] = {0};
    uint8_t write=0, read=0;

    while(str[read] != '\0')
    {
        int curr = (uint8_t)str[read];
        if(!hash[curr])
        {
            hash[curr] = 1;
            str[write] = str[read];
            write++;
        }
        read++;
    } 
    str[write] = '\0';
	//Your logic here
}

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;
}