TXT -> 2 TXT files

def convert(filename)
    destinationName = "output.txt"
    file = open(filename, 'r')
    destination = open(destinationName, 'w')

    counterLine = 0
    for line in file:
        counterLine += 1
        if counterLine > 3:
            newLine = ''
            for letter in line:
                if letter != ',':
                    newLine += letter
            destination.write(newLine)

# MAIN FUNCTION
filenames = ["Wilkinson_normS21.TXT", "Wilkinson_normS21.TXT"]
for filename in filenames:
    convert(filename)