Remove trailing whitesapce in field where expense was made

Some mobile devices automatically add a space after typing a word.  So from time-to-time multiples of the same store show up as one types in where the expense was made, the only difference is one has a space at the end.  That is annoying!  How about an on-submit or an on-end-edit action that trims both leading and trailing white-space?  Also do the same to clean up all expenses currently in the database.