Recall the library function strcat

Take a moment to recall the implementation of the library function strcat, and also recall the operation of the pointer. The essence of the C language is the pointer, which makes people love and hate ... haha

#include<stdio.h>

char *mystrcat(char *dest,const char *src)
{
	char *pTemp;

	if((NULL == dest) || (NULL == src))
	{
		printf("the address is NULL,please check it!\n");
		return NULL;
	}

	pTemp = dest;

	while(*dest != '\0')
	{
		dest++;
	}

	while(*src != '\0')
	{
		*dest = *src;
		dest++;
		src++;
	}

	return dest;
}

int main(int argc,char argv[])
{
	char *pCh = "hello";
	char ch[50] = "world";

	mystrcat(ch,pCh);

	printf("%s\n",ch);

	return 0;
}

First recall a strcat that can do basic work, followed by a little improvement and optimization ...