Remove Duplicate Characters from a String

Code

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

void remove_duplicates(char *str) {
	//Your logic here
    int arr[256] = {0};
    int left = 0;
    int right = 0;
    while (str[right]!='\0') {
        if (arr[str[right]]>0) {
            //printf("%c\n",str[right]);
            right++;
            continue;
        }
        arr[str[right]]++;
        str[left] = str[right];
        left++;
        right++;
    }
    str[left] = '\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