memcpy一种实现方法

#include<stdio.h>
#include<stdlib.h>

void* memncpy(void* dest, const void* src, int count){
    int i=0;
    //void *init_dest = dest;
    char* dest1 = (char*)dest;
    const char* src1 = (char*)src;
    for(;i<count;i++){
        *dest1=*src1;
        dest1++;
        src1++;
    }
    return dest;
}
int main(void){
    int num=3;
    char str1[8] ="abcdefg";
    char* str2 = (char*)malloc(8);
     //str1= "abcdefg"; // error: incompatible types when assigning to type ‘char[8]’ from type ‘char *
     str2= "hijklmn";
    printf("1str1：%s \n",str1);
    memncpy(str1,str2,num);
    printf("2str1: %s \n",str1);
    return 0;
}