def trim(s):
while True:
if len(s) == 0:
return s
elif s[0] == ' ':
s = s[1:]
elif s[-1] == ' ':
s = s[0:-1]
elif len(s) == 0:
else:
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def trim(s):
while True:
if len(s) == 0:
return s
elif s[0] == ' ':
s = s[1:]
elif s[-1] == ' ':
s = s[0:-1]
elif len(s) == 0:
return s
else:
return s
return s