Is there a way to set Variable with Serial Monitor?

[testing19]

I try to find out if I can set Variables with the given Serial Monitor of the arduino IDE

I had this code:

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1. #include <Preferences.h>
2. Preferences preferences;
3.  
4. void setup() {
5.   Serial.begin(115200);
6.   String keyToAdd;
7.  
8.   String valueToAdd;
9.  
10.   keyToAdd = Serial.readString();
11.   valueToAdd = Serial.readString();
12.  
13.   preferences.begin("licence",false);
14.  
15.   preferences.putString(keyToAdd.c_str(), valueToAdd);
16.   preferences.getString("roomname_long",valueToAdd);
17.   Serial.println(valueToAdd);
18.   preferences.end();
19. }

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I want to put a new roomname_long So I write to the Monitor something like:

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1. roomname_long

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And then should be the name of the value:

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1. Test

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And if I press the read button on my Esp32 it should give me the new name for roomname_long but it doesn´t work