So, the basic idea is that user presses a key on keypad, and key that is pressed is sent with RF transmitter. I got individual parts to work(keypad and transmitter), but can't send the actual key. When I try to send it, I get a strange string on the other end. I am convinced its simple issue with my syntax, so if anyone could help me, that would be great. Code is below:

#include <RH_ASK.h>
#include <SPI.h> // Not actually used but needed to compile
RH_ASK driver; //use this driver for transmitter



#include <Keypad.h>
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {10, 9, 8, 7}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {6, 5, 4, 3}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );



void setup()
{
    Serial.begin(9600);   // Debugging only
    if (!driver.init())
         Serial.println("init failed");
}

void loop()
{
  
    char key = keypad.getKey();
  
    if (key){
      Serial.println(key);//outputs correct key
      //transmitter part
//      const char *msg = "Hello World!";
      const char *msg = key;//here is the problem, when i send the string above, it works okay, when I send this, i get strange string on other end
      driver.send((uint8_t *)msg, strlen(msg));
      driver.waitPacketSent();
      Serial.println(key);//outputs correct key
      Serial.println("packet_sent");
    }
}