// different version of string copy

// ----------------------------------------------
// version 1
// ----------------------------------------------
void copy_str(char *dst, char *src) {
	int i = 0;
	while (src[i] != '\0') {
		dst[i] = src[i];
		++i;
	}
	// copy last character '\0'
	dst[i] = src[i];
}

// ----------------------------------------------
// version 2
// stop condition can be reduced to : src[i]
// assignment dst[i] = src[i] has a value of src[i]
// ----------------------------------------------
void copy_str(char *dst, char *src) {
	int i = 0;
	// while ((dst[i] = src[i]) != '\0') ++i; 
	while (dst[i] = src[i]) ++i;
}

// ----------------------------------------------
// version 3
// use of pointers and post incrementation
// ----------------------------------------------
void copy_str(char *dst, char *src) {
	while (*dst++ = *src++) ;
}