Write a function called remove_all_from_string that takes two strings, and returns a copy of the first string with all instances of the second string removed. This time, the second string may be any length, including 0.

Test your function on the strings "bananas" and "na". Print the result, which should be:

bas
You must use:

A function definition with parameters.
A while loop.
The find method.
The len function.
Slicing and the + operator.
A return statement.