problem getting function to change value of array element

[hansfordmc]

Newbie to C++ programming. I am trying to pass a pointer to an array element to a function and have the function change the value, but I'm getting a memory overwrite error when the program runs. The program sends a string to the function which is then suppose to change all of the letters to uppercase. Any help would be appreciated.

#include "stdafx.h"
#include <iostream>
#include <string>

using namespace std;
using namespace System;

void toUpper(char* letter, int len){
	
	char lower_case[] = { "abcdefghijklmnopqrstuvwxyz" };
	char upper_case[] = { "ABCDEFGHIJKLMNOPQRSTUVWXYZ" };
	int array_size = 1 * sizeof(lower_case);
	int count = 0;

		while(count < len){
			
			if(*letter == ' ') {
				count++;
				letter++;
				continue;
			}
			
			for(int i = 0; i < array_size; i++){

				if(*letter == lower_case[i]) {
					*letter = upper_case[i];
					break;
				}
				else if(*letter == upper_case[i]){
						*letter = upper_case[i];
						break;
				}
			}
		letter++;
		count++;
		}
}
	

int main(array<System::String ^> ^args)
{
	char* stars[][80] = { "Robert Redford", "Chuck Norris", "Alec Baldwin" };
	int count = 0;
	int len = strlen(*stars[0]);
	toUpper(*stars[0], len);
	cout << *stars[0] << endl;
}

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