XOR 비트연산 할 때 0이 나오면 멈춥니다

#include <stdio.h>
#include <string.h>
 
char key[100] = "key1";
 
void En_Decryption(char strEncordeData[], int strLen)
{
	int keycount = 0;
	for (int i = 0; i < strLen; i++)
	{
		strEncordeData[i] = strEncordeData[i] ^ key[keycount];
		if (keycount == strlen(key))
		{
			keycount = 0;
		}
		keycount++;
	}
}
 
int main()
{
    int i;
    char text[100] = "Hello,World!";
    int text_length = strlen(text);
 
    printf("text length : %d\n", text_length);
 
    printf("original  : %s\n", text);
    printf("original  : ");
    for(i=0; i<text_length; i++)
        printf("%02x ", text[i]);
    printf("\n");
 
 
    En_Decryption(text, text_length);
    printf("encrypted : ");
    for(i=0; i<text_length; i++)
        printf("%02x ", text[i]);
    printf("\n");
 
 
    En_Decryption(text, text_length);
    printf("decrypted : %s\n", text);
    printf("decrypted : ");
    for(i=0; i<text_length; i++)
        printf("%02x ", text[i]);
    printf("\n");
 
    return 0;
}