Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	//Your logic here
    char *result=str;
    bool isSeen[256] = {false};
    while(*str!='\0'){
        char ch=*str;
        if(!isSeen[ch]){
            isSeen[ch] = true;
            *result=ch;
            result++;
        }
        str++;
    }
    *result='\0';
    str=result;
}

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