import string


def remove_punctuation(input_string):
    """Removes punctuation from the user's input.
    
    Parameters
    ----------
    input_string : string
        String that the user inputs into the chatbot
        
    Returns
    -------
    out_string : string
        String with all the punctuation removed from the original input string.
    """
    
    out_string = ''
    for char in input_string:
        if char not in string.punctuation:
            out_string += char
        else:
            continue
    return out_string