C simple program - c

Question

I'm learning starting to learn C, so I tried to make a simple program with what I know. The program SHOULD ask for a letter, ask if you want the position of a letter in the alphabet(if so it displays "x is the y letter in the alphabet" with the suffix) and then it asks if you want the letter in binary and puts it in binary. But for some reason it doesn't work. I tried "manual debugging"(using puts() to see what doesn't work) and the class "getNumber" works but the value changes when it goes to the main class.
a returns "2686719" instead of "a is the 1st letter in the alphabet" and b returns "2b is the 2z\<<y in the alphabet".
This is the code, what did I do wrong?
#include <stdio.h>
#include <stdlib.h>
//011
int main(){
int x = 2;
char letter;
puts("Write a letter");
char temp2;
scanf("%c", &temp2);
int number;
letter = temp2;
puts("get alphabet position? y/n ");
char temp[2];
scanf("%s", temp);
char answer = temp[0];
int tempNumber2 = getNumber(letter);
if(answer == 'y'){
char suffix[3];
int number = tempNumber2;
printf("%d", number);
if (number == 1){
x = 1;
suffix[0] = "s";
suffix[1] = "t";
}else if (number < 27){
suffix[0] = "t";
suffix[1] = "h";
x = 1;
}
if (x == 1){
printf("%c is the %d", letter, number);
printf("%s in the alphabet\n", suffix);
}}else if (answer == 'n'){
x = 1;
}else if (answer != 'y' && answer != 'n'){
puts("ERROR, invalid letter");
x = 3;
};
if(x != 3){
puts("Convert to binary?");
}
return 0;
}
int getNumber(letter){
char tempLetter = letter;
int tempNumber = -1;
char alphabet[27] = "abcdefghijklmnopqrstuvwxyz";
int i = 0;
while(i < 27){
i++;
if(tempLetter == alphabet[i]){
tempNumber = i;
tempNumber++;
printf("%d \n", tempNumber);
return tempNumber;
}
};
}
By the way, I haven't gotten to the binary part hence why it's empty.

Answer 1

As everyone stated in the comments your problem is that suffix's last char is not set to '\0'.
Moreover, you could getNumber in a much simpler way:
int getNumber(char letter) {
return (int)(letter - 'a') + 1;
}
Btw, you can make your code look a little better (didn't change it too much):
int main() {
char letter;
char answer;
puts("Write a letter");
scanf("%c", &letter);
getchar(); // read \n
puts("get alphabet position? y/n ");
scanf("%c", &answer);
getchar(); // read \n
if (answer == 'n') {
return 0;
}
if (answer != 'y') {
puts("ERROR, invalid letter");
return 1;
}
int number = getNumber(letter);
char suffix[3];
suffix[2] = 0;
if (number == 1) {
suffix[0] = 's';
suffix[1] = 't';
} else if (number == 2) {
suffix[0] = 'n';
suffix[1] = 'd';
} else if (number == 3) {
suffix[0] = 'r';
suffix[1] = 'd';
} else {
suffix[0] = 't';
suffix[1] = 'h';
}
printf("%c is the %d%s letter in the alphabet\n", letter, number, suffix);
puts("Convert to binary?");
return 0;
}