C语言 strcat的实现

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
void mystrcat(char *arr1, char *arr2,int leng)
{
	int i=1,m=0,length=0;
	while(i)
	{
		if (*(arr1 + m) != '\0')
		{
			length++;
			m++;
			continue;
		}
		i = 0;
	}
	for (i = length, m = 0; i <= length + leng; m++, i++)
	{
		*(arr1 + i) = *(arr2 + m);
	}
}
int main()
{
	char arr1[10] = "abcd";
	char *arr2 = "efghh";
	int leng = strlen(arr2);
	mystrcat(arr1, arr2,leng);
	printf("%s", arr1);
	system("pause");
	return 0;
}