Cursor To Stay On The Cell After Pressing Enter

Imagine you have only one column - column A. In column A you have 500,000 + rows with text like the following:

!magnus
snooze'
sleepy/
act noun
act verb
Today&tomorrow
*bialgebras
/dev/ null
dev
ull
1970;
Dwight Schrute

and your goal is to figure out a way to simultaneously transform the above rows into:

snooze
sleepy
act
act
Todaytomorrow
bialgebras
devnull
devnull
1970
DwightSchrute

I know I can use Filter and filter out characters like &'!/; but that takes too long because I have a lot of lists to go through with thousands of entries. There must be a macro that will close spaces between words when only one space exists, but eliminate every word if 2 or more spaces exist between words - as well as eliminate unwanted characters like the ones I described above. I know I could use substitute and eliminate the spaces between words =substitute(a1," ","") but then I'd have to filter each and every instance of unwanted character.