Generate Key

char generateKey(char * ch)
{
    int i, j, n;
    bool check1 = true, check2 = true, check3 = false;
    int length = strlen(ch);
    printf("%s: %d\n", ch, length);
    char *alphabet = "ZYXWVUTSRQPONMLKJIHGFEDCBA";
    char *endkey = "";
    for (i = 0; i < length; i++){
        n = strlen(endkey);
        for (j = 0; j < n; j++){
            n = strlen(endkey);
            printf("%s: %d\n", endkey, n);
            if (endkey[j] == ch[i]){
                check1 = false;
            }

            printf("Hi.\n");
            if (check1 != false){
                printf("Hey.\n");
                strcat(ch[i], endkey);
                printf("Evening.\n");
                check3 = true;
            }
            check1 = true;
            if (check3 == true){
                break;
            }
        }
    }

    for (i = 0; i < strlen(alphabet); i++){
        for (j = 0; j < strlen(endkey); j++){
            if (alphabet[i] == endkey[j]){
                check2 = false;
            }
        }
        if (check2 != false){
            strcat(i, endkey);
        }
    }

    return endkey;
}