Remove Duplicate Characters from a String

Code

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

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

    for(int read = 0; str[read] != '\0'; read++){
        unsigned char ch = str[read]; 
        if(!seen[ch]){
            seen[ch] = 1; 
            str[write++] = ch;
        }
    }
    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