Minecraft java command block reply "you don't have enough money"

I'm making a Minecraft virtual market and, here are my commands for command blocks.

First command block: Impulse, Unconditional, Needs Redstone

/tellraw @p {"text":"Succesfully purchase an item","color":"gree n"}

Second command block: Chain, Unconditional, Always Active

/scoreboard players remove @p[distance=..7,scores={money=100..}] money 100

Third command block: Chain, Unconditional, Always Active

/give @p minecraft:golden_apple 1

How do I make another command such that when you run out of money it says say "you don't have enough Money".

Use /execute if score:

execute if score @p money matches ..99 run tellraw @p "currency deficiency"
execute if score @p money matches 100.. run tellraw @p "purchase made"

Replace the /tellraws with whatever you need to make your machine work.

I also see that if you have enough money, you're going to want to run multiple commands if the condition passes. Your can either have one check per step:

execute if score @p money matches 100.. run tellraw @p "purchase made"
execute if score @p money matches 100.. run scoreboard players remove @p money 100

Or you can setup a function.