You don't mention which program(s) you are using.
The easy answer is to use a decent word processor such as Microsoft Word. This will have auto formatting rules that cater for things such as double spaces that aren't after a full stop.
Where that doesn't work, many programs have a Find and Replace option. Use this and type two spaces in the find box and one space in the replace box. Go through replacing each one manually as you want, or hit Replace All. Try using CTRL+F to access this option. This works on OpenOffice.org Writer (a free alternative to Microsoft Word - you can obtain it from
www.openoffice.org if you do not have Word). Word should be the same - CTRL+F to open Find, then depending on version it will have a Replace tab. If not, look on the Edit menu for Find and Replace. In Notepad, there is a Replace option on the Edit menu (CTRL+H).
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