#include <iostream>
#include <cstring>
using namespace std;
 
const char* my_strchr(const char *place_to_find, char what_to_find)
{
for(int i=0;place_to_find[i];i++)
    if(what_to_find==place_to_find[i]) return place_to_find+i;
return NULL;
}
int main()
{
const char *vocals1="AEIOUaeiou";
char vocals2[]="AEIOUaeiou";
cout<<strchr(vocals1,'e') << endl;
cout<<strchr(vocals2,'e') << endl;
cout<<my_strchr(vocals1,'e') << endl;
cout<<my_strchr(vocals2,'e') << endl;
return 0;
}

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