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Ruby, 70 bytes ->s{s+=s.reverse;s[..-2].gsub(/./){t=$&+' '*$.+$/;t[-2]=$&;$.+=1;t}+s} Try this online!
Answer
#1: Initial revision
by
radarek
·
2022-01-15T10:49:47Z (almost 3 years ago)
# [Ruby](https://www.ruby-lang.org), 70 bytes
```ruby
->s{s+=s.reverse;s[..-2].gsub(/./){t=$&+' '*$.+$/;t[-2]=$&;$.+=1;t}+s}
```
**[Try this online!](https://ato.pxeger.com/run?1=m72kqDSpcsHiNNuYpaUlaboWN9107Yqri7Vti_WKUstSi4pTrYuj9fR0jWL10otLkzT09fQ1q0tsVdS01RXUtVT0tFX0rUuigdJAIWsg19bQuqRWu7gWYtr6gtKSYoW0aCWP1JycfKVYiOiCBRAaAA)**