def validate_personal_questions(post)
      error_messages = ''

      if post[:postal_code].empty? or !PostalCodeService.is_valid_postal_code?(post[:postal_code])
        error_messages = 'Please enter a valid postal code '
      else
        if post[:term].nil?
          error_messages = 'Select a 3 or 5 year term. '
        else
          if post[:estimate].empty? and post[:gas_used].empty?
            error_messages = 'Please enter a value for Option A or Option B'
          end
        end
      end

      if error_messages.empty?
        if !post[:estimate].empty? and !post[:gas_used].empty?
          error_messages = 'You can only fill in option A or B. '
        else
          if !(post[:estimate].empty?) and (post[:estimate].to_i < 1)
            error_messages = 'Make sure you put in a proper value into estimate. '
          end
          if !(post[:gas_used].empty?) and (post[:gas_used].to_i < 1)
            error_messages = 'Make sure you put in a proper value into the gas used field. '
          end
        end
      end

      return error_messages
    end