Coming to this late but here's my version anyway:
shuffle=: {~ [: ?~ #
spacing=: [: , ' '&,.
pad=: |."_1~ i.&.-@#
gw=: [: pad spacing@shuffle\ NB. what does gw stand for?
gw 'cherrytree'
c
c h
e c h
c h r e
c r h r e
r e c y h r
y t e h r r c
r h r r y c e t
r r h r c e e t y
h e c r e r t y r e
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