def remove_punctuation(string):
    """Solution to exercise C-1.25.

    Write a short Python function that takes a string s, representing a
    sentence, and returns a copy of the string with all punctuation removed.
    For example, if given the string "Let s try, Mike.", this function would
    return "Lets try Mike".
    """
    punctuation_list = list('\'\".,;:?!-(){}[]')
    new_string = ''
    for char in string:
        if char not in punctuation_list:
            new_string += char
    return new_string