import data from cpp file into arduino sketch

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i want import myLine variable that is in cpp library into arduino sketch

I really have no idea what you mean by "import". A variable is a memory address. That address is either in scope or it isn't. If it is, there is no need to import anything. If it isn't, there is no meaning to "import".

			Serial.println(line);

Anonymous, undelimited printing of strings is stupid. Print the name of the variable AND print something before AND after the string, so you really have a handle on what is printed.