Given a string made up of letters a, b, and/or c, switch the position of letters a and b (change a to b and vice versa). Leave any incidence of c untouched.
Example:
'acb' --> 'bca'
'aabacbaa' --> 'bbabcabb'
def switcheroo(string):
    #your code here
    result = ''
    for letter in string:
        if letter == 'a':
            letter = 'b'
        elif letter == 'b':
            letter = 'a'
        result += letter
    return result
def switcheroo(string):
    #your code here
    result = ''
    for letter in string:
        if letter == 'a':
            letter = 'b'
        elif letter == 'b':
            letter = 'a'
        result += letter
    return result