Dictionary with pointers - c++

Question

I want to write a program that adds words to a lexicon with pointers. However, I must not use strdup(), how can I do that? Below is what I tried but it gives me this error:
Exception thrown at 0x7C87EE72 (ucrtbased.dll) in (name of the file.exe): 0xC0000005: Access violation writing location 0xCDCDCDCD.
The problem is in the newStr() function.
#include <cstring>
#include <string>
#pragma warning (disable:4996)
#include <iostream>
using namespace std;
void delStr(char**&, int&, char*);
void newStr(char**&, int&, char*);
void printchar(char**, int, char);
char* searchStr(char**&, int&, char*);
void printAll(char**&, int);
enum ACTIONS { NEW, DELETE, SEARCH, PRINTLETTER, PRINTALL, EXIT };
int main() {
char** lexicon = NULL;//pointer to pointer fo the dictionary
int x = 0;
int size = 0;
char word[81];
char ch;
cout << "Enter 0-5:" << endl;
cin >> x;
while (x < 0 || x > 5) {//while loop for correct input
cout << "ERROR" << endl;
cin >> x;
}
while (x >= 0 && x <= 5) {
switch (x) {
case NEW:
cout << "Enter the word:" << endl;
ch = cin.get();
cin.getline(word, 80);
newStr(lexicon, size, word);
printAll(lexicon, size);
break;
case DELETE:
cout << "Enter the word to delete:" << endl;
ch = cin.get();
cin.getline(word, 80);
delStr(lexicon, size, word);
printAll(lexicon, size);
cout << endl;
break;
case SEARCH:
cout << "Enter the word to search for:" << endl;
ch = cin.get();
cin.getline(word, 80);
searchStr(lexicon, size, word);
break;
case PRINTLETTER:
cout << "Enter the char:" << endl;
ch = cin.get();
ch = cin.get();
printchar(lexicon, size, ch);
cout << endl;
break;
case PRINTALL:
if (size > 0 && lexicon != NULL) {
printAll(lexicon, size);
}
break;
case EXIT:
return 0;
break;
}
cout << "Enter your choice:" << endl;
cin >> x;
while (x < 0 || x > 5) {//while loop for correct input
cout << "ERROR" << endl;
cin >> x;
}
}
return 0;
}
void printAll(char**& lex, int size) {
for (int i = 0; i < size; i++) {
cout << lex[i] << " ";
}
cout << endl;
}
void newStr(char**& lex, int& size, char* word) {
int i = 0;
for (i = 0; i < size; i++) {
if (strcmp(lex[i], word) == 0) {
//cout << "Word " << word << " already exists\n";
return;
}
}
if (size == 0) {
lex = new char* [1];
for (int i = 0; i < strlen(word); i++) {
strcpy(*lex, word);
}
size++;
}
else {
char** temp = new char* [size + 1];
for (i = 0; i < size; i++) {
temp[i] = lex[i];
}
//strcpy(temp[size],word);
strcpy(temp[size], word);
delete[] lex;
lex = temp;
size++;
}
}
void delStr(char**& lex, int& size, char* word) {
int j = 0;
for (int i = 0; i < size; i++) {
if (strcmp(lex[i], word) == 0) {
for (j = i; j < size - 1; j++) {
lex[j] = lex[j + 1];
}
size--;
char** temp = new char* [size];
for (j = 0; j < size; j++) {
temp[j] = lex[j];
}
delete[] lex;
lex = temp;
}
}
}
void printchar(char** lex, int size, char ch) {
for (int i = 0; i < size; i++) {
if (lex[i][0] == ch) {
cout << lex[i] << " ";
}
}
}
char* searchStr(char**& lex, int& size, char* word) {
for (int i = 0; i < size; i++) {
if (strcmp(lex[i], word) == 0) {
cout << "Found" << endl;
//cout << "Word " << word << " already exists\n";
return lex[i];
}
}
cout << "Not found";
return NULL;
}