ReadStr

char* ReadStr() {
    int len, curr;
    char c;
    char* str;

    len = READSTRLEN;
    curr = 0;
    str = (char*)malloc(len * sizeof(char));
    fflush(stdin);
    c = getchar();

    while (c != 10) {
        if (curr >= len) {
            len += READSTRLEN;
            str = (char*)realloc(str, len * sizeof(char));
        }
        str[curr] = c;
        curr++;
        c = getchar();
    }
    str[curr] = 0;
    curr++;
    str = (char*)realloc(str, curr * sizeof(char));
    fflush(stdin);
    return str;
}