Code one yourself. But here is the basic Bot code. He can only say pong! when you type !ping:

import discord
import os

client = discord.Client()

client = commands.Bot(command_prefix = '!') #prefix

@client.event
async def on_ready():
print("bot online") #will print "bot online" in the console when the bot is online

@client.command()
async def ping(ctx):
await ctx.send("pong!")

client.run(os.getenv("TOKEN"))

Not code:
Insert your bot link into the environmental variable with the "key" TOKEN