Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	//Your logic here
    bool seen[256]  ={false};
    int read = 0, write = 0;
    char *ram = str;
    while(*( str + read) != '\0'){
        if(!seen[*(str  + read)]){
            seen[*(str  + read)] = true;
            *(ram + write) = *(str + read);
            write++;
        }
        read++;
    }
    *(ram + 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