Description: https://www.codewars.com/kata/599057654f613e6a1c000082

cell0 = if one then set default message
cell1 = always zero 
cell2 to cell7 = 'Hello '
cell8 to celln = rest of the message

+ cell0 to one

> leave cell1 with zero

> fill cell2 to cell7 with 'Hello '
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>
++++++++++++++++++++++++++++++++>

, 
[  if is not EOF 
  [>,] read rest of the input on cell8 to celln
  +++++++++++++++++++++++++++++++++ put '!' on end
  [<]< go to cell0
  -     cell0 to 0 
  >>[>] go to after last char
]

<[<]< go to cell0

[
  >>[>] go to cell8
  put 'World!' in range cell8 to cell13
  +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>
  +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>
  +++++++++++++++++++++++++++++++++
  [<]< go to cell0
  - cell0 to 0
]


>> go to cell2 | which is the first char

[.>] print each char until found EOF
