error: 'contrast' was not declared in this scope; did you mean 'constrain'?

[antoniosap]

please declare, on top:

void contrast(int value);

else have this error:

src/main.cpp: In function 'void loop()':
src/main.cpp:110:5: error: 'contrast' was not declared in this scope; did you mean 'constrain'?
  110 |     contrast(128);
      |     ^~~~~~~~
      |     constrain
*** [.pio/build/heltec_wifi_kit_8/src/main.cpp.o] Error 1