human
Solve the following python programming problem given the following code:
@ register.filter 
def buglise(s) : 
    s = unicode (s) 
    def replace_username(match) : 
        username = match.group (0) [1 :] 
        if (username.lower () == 'all') : 
            return '<strong>@all</strong>' 
else : 
            return ('<a href="/%s/">@%s</a>' % (username, username)) 
s = username_re.sub (replace_username, s) 
    s = hashtag_re.sub ((lambda m : ('%s<a href="/search/?q=%s">%s</a>' % (m.group (1), urllib.quote (m.group (2)), m.group (2)))), s) 
    return mark_safe (replace_username) 

    
    

    Fix the buggy line: return mark_safe (replace_username)
assistant
#Here is Python code to fix the buggy line: return mark_safe (replace_username)
.

return mark_safe (s)