Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	//Your logic here //baba
    int seen[256] = {0};
    int write_ptr=0;
    for(int read_ptr=0;str[read_ptr]!='\0';read_ptr++){
        unsigned char current = str[read_ptr];
        if(seen[current]==0){ 
                seen[current]=1;
                str[write_ptr]=str[read_ptr];
                write_ptr++;
            }
        }str[write_ptr]='\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