It shows the scope errors

int main()
{
	int Number_of_names;
	cout << "How many names do you want to enter? ";
	cin >> Number_of_names;
	cin.ignore(1000, '\n');

	char** names = NULL;
	// Do NOT allocate twice!!
	// names = new char*[Number_of_names];
	// for (int i = 0; i < Number_of_names; i++) {
	//	 names[i] = new char[20];
	// }
	names = name_list_input(Number_of_names);

	name_list_output(names, Number_of_names);

	name_list_lastsort(names, Number_of_names);

	name_list_output(names, Number_of_names);

	// dont forget to free allocated memory!
	name_list_free(names, Number_of_names);

	return 0;
}
int mystrlen(char* s) 
{
	int i;
	for (i=0; s[i] != NULL; i++);
	return i;
}

int compare_C_strings(char* s1, char* s2)
{
	int lenS1 = mystrlen(s1);
	int lenS2 = mystrlen(s2);
	int n = (lenS1 <= lenS2) ? lenS1 : lenS2;

	for (int i = 0; i<n; i++)="" {
="" if="" (s1[i]=""> s2[i])
			return 1;
		if (s1[i] < s2[i])
			return -1;
	}
	return 0;
void name_list_lastsort(char**names, int n)
{
	int* sep = new int[n];  // allocate array of n int

	// find last names
	int j = 0;
	for (int i = 0; i < n; i++) {
		for (j = 0; (names[i][j] != NULL) & (names[i][j] != ' '); j++);
		sep[i] = (names[i][j] == ' ') ? j+1 : 0;
	}

	// sort names
	for (int i=0; i