In order to send a markdown codeblock properly, you should do as shown in order:

1) \`\`\`
   - There should be three backticks.
2) \`\`\`\<language\>
   - After the three backticks, label the codeblock by its language (optional). If supported, the text will appear highlighted by the language syntax provided.
   - Example: \`\`\`js
3) \`\`\`js
console.log("Hello World!");
   - Insert the code after adding a linebreak after the language you provide. Github does not show the line break after `js`, but it's required.
4) \`\`\` (end)
   - End your codeblock by adding three backticks at the end. Do not type (end) at the end.

Example:
\`\`\`js
for (let i = 0; i < 100; i++) { console.log(`All the wonderful numbers! ${i + 1}`); }
\`\`\`
Becomes:
```js
for (let i = 0; i < 100; i++) { console.log(`All the wonderful numbers! ${i + 1}`); }
```

```py
def fn():
    return fn
```

NOTE: Codeblocks depend on how the service you're using formats it. For example: Discordapp allows the ending backticks to be on the same line as the code, while Github does not.