def find_and_append_text(text, search_string, extra_text):
    """Finds a substring in a string and appends extra text in located position.
    
    Arguments:
        text {string} -- Full text to search for substring
        search_string {string} -- keyword to search for
        extra_text {string} -- text to append after search_string is found
    """

    index = text.find(search_string)
    index = index + len(search_string)
    result_text = text

    if index >= 0:
        result_text = text[:index] + extra_text + text[index:]
    
    return result_text