Write a function which takes a number and returns the corresponding ASCII char for that value.
Example: 
~~~if-not:java,racket
```
get_char(65) # => 'A'
```
~~~
~~~if:java
~~~
~~~if:racket
~~~
For ASCII table, you can refer to http://www.asciitable.com/
def get_char(c: int) -> str:
  return chr(c)
def get_char(c: int) -> str:
  return chr(c)