# by Artyom Bologov
H
,p
# Remove the empty/spaced lines after comments
g/^.[[:space:]]*$/s///
# Remove comments
g/\(.\)\(.*\)\1.*/s//\2/
# Strip spaces off
g/^[[:space:]]\{1,\}\(.*\)/s//\1/
g/\(.*\)[[:space:]]\{1,\}$/s//\1/
,p
Q