write this code on Arduino

or write a new functions, one takes chars on by one and appends them to a string, and another function does the process in reverse, i.e. gets the char at a specific index of a string.

#include using namespace std; //method to append a char to string string appendChar(string s,char c) S S+C, return s; //method to return char at specific index char charAtfstring s.int i) return s[i; int main //testing both methods string h = "hell"; cout using namespace std; //method to append a char to string string appendChar(string s,char c) S S+C, return s; //method to return char at specific index char charAtfstring s.int i) return s[i; int main //testing both methods string h = "hell"; cout