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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def format_sourcefile_name(self, fileName, runSet):
        '''
        Formats the file name of a program for printing on console.
        '''
        if fileName.startswith(runSet.common_prefix):
            fileName = fileName[len(runSet.common_prefix):]
        return fileName.ljust(runSet.max_length_of_filename + 4)