Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	//Your logic here
    bool seen[256] = {false};
    int read_indx = 0;
    int write_indx = 0;

    while(str[read_indx] != '\0')
    {
        if(!seen[str[read_indx]])
        {
            str[write_indx] = str[read_indx];
            seen[str[read_indx]] = true;
            write_indx++;
            
        }
        
        read_indx++;
    }

    str[write_indx] = '\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