What's the wrong in this code?

Question

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>

int main() {
char phrase[100];
fgets(phrase,100,stdin);

// convert everything to lower case
for(int i = 0; phrase[i]; i++) {
phrase[i] = tolower(phrase[i]);
}
char ciphertext[100];

char *alphabet = "abcdefghijklmnopqrstuvwxyz";
char *alphakey = "zyxwvutsrqponmlkjihgfedcba";

for(int i = 0; i < (int) strlen(phrase); i++) {

// just add to ciphertext if space
if (*(phrase + i) == ' ') {
ciphertext[i] = *(phrase + i);
}
else {
for(int x = 0; x < (int) strlen(alphabet); x++) {
if (*(phrase + i) == *(alphabet + x)) {
// get letter from the same index in alphakey
ciphertext[i] = *(alphakey + x);
}
}
}
}

printf("%s\n", ciphertext);
return 0;
}
https://www.sololearn.com/coach/66?ref=app

Answer 1

I am a c noob but it seems there are some garbage values of your ciphertext array that got printed to the screen.
This hack passed all test cases:

char ciphertext[100];
for(int i = 0; i <= 100; i++){
ciphertext[i] = 32;
}

[Late edit] I forgot to say:
32 == ' ' (space)

Answer 2

Sorry bro 9334583354 this is

Answer 3

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