def title_case(sentence):
    """
    Convert a string into title case.

    Title case means that the first letter of each word is capitalized with all other letter lower case
    
    Parameters
    ----------
    sentence : str
        String to be converted into title case.

    Returns
    -------

    title : str
        String in title case format.

    Example
    -------
    >>> title_case("ThiS iS a STriNG To bE coNVERTed")
    'This Is A String To Be Converted'
    """
    
    words = sentence.split()
    title = ""
    for word in words:
        title = title + word[0].upper() + word[1:].lower() + " "
    return title