Text block generator

block.rb

def block(str)
  chars = str.upcase.chars
  size = chars.size

  result = Array.new(size) { Array.new(size) { ' ' } }

  chars.each_with_index do |char, i|
    result[0][i] = char
    result[i][i] = char
    result[i][0] = char
  end

  result.map do |res|
    res.join(' ')
  end.join("\n")
end

res = block(ARGV[0])
puts "`#{res}`"

# $ ruby block.rb hello

# `H E L L O
# E E
# L   L
# L     L
# O       O`