class StringTools:
    def reverse(self, phrase):
        return phrase[::-1]

    def add_something_in_the_end(self, phrase, something):
        return phrase+" "+something
43b352a9a33685ac1675b2612447fccb6b4c6c16
<mask token>

class StringTools:
    <mask token>
    <mask token>

class StringTools:

    def reverse(self, phrase):
        return phrase[::-1]
    <mask token>

class StringTools:

    def reverse(self, phrase):
        return phrase[::-1]

    def add_something_in_the_end(self, phrase, something):
        return phrase + ' ' + something

class StringTools:
    def reverse(self, phrase):
        return phrase[::-1]

    def add_something_in_the_end(self, phrase, something):
        return phrase+" "+something