style: modify the output of scripts

Instead of separating output primes by newline, the scripts now separate
by spaces.

fish/nixpkgs/soe

@@ -7,7 +7,7 @@ set nums (seq 2 $num)[..-2]
 
 while test -n "$nums"
     set prime $nums[1]
-    echo $prime
+    echo -n "$prime "
 
     set -e nums_
     for elem in $nums
@@ -15,3 +15,5 @@ while test -n "$nums"
     end
     set nums $nums_
 end
+
+echo