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string-trim

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#1 Created at ... [Delete] [Delete and Lock User] 
def trim(s):
    li, ri = 0, len(s)
    while li < ri and s[li] == ' ':
        li += 1
    while ri - 1 > li and s[ri - 1] == ' ':
        ri -= 1
    return s[li:ri]
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