/* mystring-function.c */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

char *mystrcpy(char *str1, const char *str2);
char *mystrcat(char *str1, const char *str2);
int mystrcmp(const char *str1, const char *str2);
size_t mystrlen(const char *str);

int main(void)
{
	char *str;

	str = (char *)malloc(100 * sizeof(char));

	strcpy(str, "abc");
	mystrcat(str, "defg");

	printf("str=%s\n", str);
	printf("%zu\n", mystrlen(str));

	printf("%d\n", mystrcmp(str, "abd"));
	printf("%d\n", mystrcmp(str, "abb"));

	free(str);
	return 0;
}