字符串某位置插入字符

#include<iostream>#include<stdio.h>#include<string.h>using namespace std;void insert_data(char* target,int index,char data){    int len=strlen(target);    for(int i=len;i>index-1;i--)    {        target[i]=target[i-1];    }    target[index-1]=data;    target[len+1]=0;}void show_all(const char* target){    int len=strlen(target);    for(int i=0;i<len;i++)        cout<<target[i];    cout<<endl;}int main(){    char obj[]="hello";    insert_data(obj,5,'a');    show_all(obj);    return 0;}