1. Write a function that reverses its string argument.

def reverse(astring):

# your code here

After developing the program, implement a test case for a function used in this program.

2.Write a function calledremove_dupsthat takes a string and creates a new string by only adding those characters that are not already present. In other words, there will never be a duplicate letter added to the new string.

def remove_dups(astring):

# your code here

print(remove_dups("mississippi"))#should print misp