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##Windows PowerShell, 36 74 138
$input-replace'(?<!^ *) (?! *$)','@'
##Windows PowerShell, 36 7574 138
##Windows PowerShell, 36 75 138
##Windows PowerShell, 138
Very ungolfed.36 75 138
$input|%{$x=$_-match'^ *' $l=$Matches[0].Length $x=$_$input-match' *$' $t=$Matches[0].Length ' '*$l+replace'($_-replace'^?<!^ *|*) *$'-replace'(?! *$)','@')+' '*$t}
Very ungolfed.
$input|%{$x=$_-match'^ *' $l=$Matches[0].Length $x=$_-match' *$' $t=$Matches[0].Length ' '*$l+($_-replace'^ *| *$'-replace' ','@')+' '*$t}