# Task
 You are implementing your own HTML editor. To make it more comfortable for developers you would like to add an auto-completion feature to it.
 Given the starting HTML tag, find the appropriate end tag which your editor should propose.
# Example
 For startTag = "<button type='button' disabled>", the output should be "</button>";
 For startTag = "<i>", the output should be "</i>".
# Input/Output
 - `[input]` string `startTag`/`start_tag`
 - `[output]` a string
def html_end_tag_by_start_tag(start_tag):
    if " " in start_tag:
        a = start_tag.split(" ")
        return "</" + a[0][1:] + ">"
    else:
        return "</" + start_tag[1:-1] + ">"
def html_end_tag_by_start_tag(start_tag):
    if " " in start_tag:
        a = start_tag.split(" ")
        return "</" + a[0][1:] + ">"
    else:
        return "</" + start_tag[1:-1] + ">"