Build a pyramid-shaped tower, as an array/list of strings, given a positive integer number of floors. A tower block is represented with "*" character.
For example, a tower with 3 floors looks like this:

[
  "  *  ",
  " *** ", 
  "*****"
]
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def tower_builder(n_floors):
    return [(("**"*i)[:-1]).center((n_floors*2)-1) for i in range(1,n_floors+1)]
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