Read txt file & execute the methods

Every time you run the below program, a random first name and last name is generated by function using com.thedeanda.lorem.Lorem

def stringBody = """
{
	"first_name": "${randomData.TestDataGenerator.getRandomFirstName()}",
	"middle_name": "${randomData.TestDataGenerator.getRandomLastName()}",
	"last_name": "API",
	"date_of_birth": "12/12/2000"
}
"""
println stringBody

===OUTPUT===
image

My requirement is to read data from Variable.txt file & execute the methods
Variable.txt (202 Bytes)

I am using the below code to read the txt file

import java.nio.charset.StandardCharsets as StandardCharsets
import org.apache.commons.io.FileUtils as FileUtils

File file = new File('C:/Users/NaMohammed/Desktop/Variable.txt')

String content = null

try {
    content = FileUtils.readFileToString(file, StandardCharsets.UTF_8)
}
catch (IOException e) {
    e.printStackTrace()
} 

println(content)

XXX = OUTPUT = XXX