memcpy一种实现方法

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

 void* memncpy(void* dest, const void* src, int count){
     int i=;
     //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=;
     char str1[] ="abcdefg";
     char* str2 = (char*)malloc();
      //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 ;
 }