Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	//Your logic here

    int ascii[256] = {0}; //ascii value occurance (preset to 0; if occured, will be modified to 1)
    int i = 0, j = 0;

    while(str[i] != '\0'){
    if(!ascii[str[i]]){ //check if ascii value found, 
        ascii[str[i]] = 1; //if not then update the ascii value entry
        str[j++] = str[i]; //move the write pointer (j) forward 
    }
    i++;
    }
    str[j] = '\0'; //terminate the modification of str
}

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