Converting array to char

Question

I'm trying to convert a char array to a char. i used this code

char code[4] = {'1','2','3','4'};
char strcode[4];
void setup()
{
 Serial.begin(9600);
}
void loop()
{
 memcpy(strcode, code, 4);
 Serial.println(strcode);
 Serial.println("done");
 delay(1000);
}

But for some reason when i read my serial monitor i get this:

1234
done

Why are there 2 squares behind it? Am I doing it wrong?

EDIT: For some reason stackexchange doesn't show the 2 squares but there are 2 squares behind 1234

Answer 1

C strings need to be NUL-terminated.

char strcode[5];
 ...
 ...
 ...
 strcode[4] = '0円';
 ...