Not able to do char* to char**

I don't get that. It's a 2 byte string. 10 and 0

I'm pretty sure that if you run this

const char* data = "\n";

void setup() {
  Serial.begin(115200); Serial.println();
  Serial.print("size of data = "); Serial.println(sizeof data);
  for (byte i = 0; i < sizeof data; i++)  {
    Serial.print(i); Serial.print(" -> "); Serial.println((byte) data[i]);
  }
}

void loop() {}

the Serial monitor will tell you

size of data = 2
0 -> 10
1 -> 0
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