This program takes a sentence and capitalizes each word.

title_case.rb

def title_case(sentence1)
  if sentence1.kind_of? String
    sentence1 = sentence1.downcase.split.to_a.map {|word| word.capitalize }
    sentence1.join(" ")
  else
    "You should try and enter in a sentence."
  end
end


puts "'#{title_case([2,3,4])}' should be 'You should try and enter in a sentence.'"
puts "'#{title_case("OK. NO WAY.")}' should be 'Ok. No Way.'"
puts "'#{title_case("where are you going?")} should be 'Where Are You Going?'"
puts "'#{title_case("hi")} should be 'Hi'"
puts "'#{title_case("HI")} should be 'Hi'"
puts "'#{title_case("tHiS Is A bIt OvErKiLl. BuT wHaT tHe HeLl.")} should be 'This Is A Bit Overkill. But What The Hell.'"