I want to concatinate two values into a single string : i have two different values systolic and diastolic blood pressure readings in string, i just want when those two values come from front-end i'll just store them into a single string E.g if systolic ='120' and diastolic='80' i want it to be bp='120/80'

# frozen_string_literal: true

module Api
  module V1
    module CheckinMachine
      class BpsController < ApplicationController
        include MachineError
        before_action :authenticate_user!

        def create
          raise BatteryNotFunctionalError if battery_functional?
          # user = User.find_by!(bp_machine_imei: params[:imei])
          health_reading = current.health_readings.create!(key: :blood_pressure, value: bp_value)
          Solera::PostActivityApi.call(user,
                                       bp,
                                       health_reading.solera_activities.new)
          head :ok
        rescue ActiveRecord::RecordNotFound => _e
          render_machine_error and return
        end

        def show
          puts params
        end

        private

        def bp
          {
            systolic_blood_pressure: params[:systolic],
            diastolic_blood_pressure: params[:diastolic]
          }
        end
      end
    end
  end
end


That's what i have tried, what do i do to make it exactly like i want it to be

like bp = '120/80'