一个练习分割字符串,二级指针分配内存

#include 
#include "string.h"
#include "stdlib.h"
///自己封装的拷贝字符串的方法
int ericCopy(char *to,char *from,long num){
    int ret = 0;
    if (from == NULL||to==NULL||num ==0) {
        return -1;
    }
    for (int i = 0; strlen(from); i++) {
        if (i