StripNewlines removes any newlines in a record
Line represents a line we read from a csv file
NewLine creates a Line structure
Mutator is a function that knows how to mutate a Line
CheckWithdrawal converts an entry like 'Check Withdrawal: #999999' to '(#999999)'
RemoveText removes the substring rem, if it is present, up to one time.
ReplaceHeader changes the first line