tech_interview_refactor.rb

def solve_problem
  numbs = Array(1..999)
  mults_of_3 = []
  mults_of_5 = []
  all_mults = []
  the_answer = 0
  numbs.each do |number|
    if number % 3 == 0
      mults_of_3 << number
    end
  end
  numbs.each do |number|
    if number % 5 == 0
      mults_of_5 << number
    end
  end
  all_mults = mults_of_3 + mults_of_5
  all_mults = all_mults.flatten
  all_mults = all_mults.uniq
  all_mults.each do |a_mult|
    the_answer = the_answer + a_mult
  end
  return the_answer
end

puts solve_problem