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With witch function would I be able to search for the "\n\n" characters?

The == operator and a state machine.

First, though, just print each character you are reading twice (yes, that means you need to store it). First as a character then in HEX format.

char inChar = WiFly.read();
Serial.print(inChar);
Serial.print(" (");
Serial.print(inChar, HEX);
Serial.println(")");

This will let you learn exactly what character(s) denote a blank line.