Crystal Project of a lot of mini projects from a list, from Ruby

crystal.rb

require 'fileutils'
file = File.open('list.txt', 'r')

File.open('shard.yml', 'w') do |f1|
  f1.puts "name: 100projects\nversion: 0.1.0\n\nauthors:\n  -  <>\n\ntargets:\n"
  while line = file.gets
    filename = line.strip.gsub(/[^\w\.]/, '_').downcase
    f1.puts "  #{filename}:\n    main: src/#{filename}/main.cr"
    FileUtils::mkdir_p "src/#{filename}"
    File.new "src/#{filename}/main.cr", 'w'
  end
  f1.puts "\ncrystal: 0.22.0\n\nlicense: MIT\n"
end