sem3-problem2

#include <stdio.h>
#include <stdbool.h>
#define N 100

void getstr(char s[]) {
    char c;
    int i = 0;
    while((c = getchar()) != '\n')
        s[i++] = c;
    s[i] = '\0';
}

char *filterChars(char s1[], char s2[]) {
    static char ans[N];
    int i = 0, j = 0, k = 0;
    bool filter = false;
    for (i = 0; s1[i] != '\0'; i++) {
        for (j = 0; s2[j] != '\0'; j++) {
            if (s1[i] == s2[j])
                filter = true;
        }
        if (!filter)
            ans[k++] = s1[i];
        filter = false;
    }
    return ans;
}

int main() {
    char s1[N], s2[N];
    getstr(s1);
    getstr(s2);
    char *s3 = filterChars(s1, s2);
    printf("%s", s3);

    return 0;
}