sem3-problem3

#include <stdio.h>
#include <ctype.h>
#define N 10000

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

char *expandChars(char s[]) {
    static char ans[N];
    int i = 0, k = 0;
    char start, end, c;
    for (i = 0; s[i] != '\0'; i++) {
        if ((s[i] == '-' && i > 0 && s[i + 1] != '\0') &&
                (isdigit(s[i - 1]) && isdigit(s[i + 1]) ||
                (isalpha(s[i - 1]) && isalpha(s[i + 1]) &&
                (islower(s[i - 1]) && islower(s[i + 1]) ||
                isupper(s[i - 1]) && isupper(s[i + 1]))))) {

            start = s[i - 1];
            end = s[i + 1];

            for (c = (start < end) ? (start + 1) : (start - 1);
                    c != end;
                    (start < end) ? c++ : c--)
                ans[k++] = c;

        } else {
            ans[k++] = s[i];
        }
    }

    return ans;
}

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

    return 0;
}