while len(s) > 0:
if s[0] == ' ':
s = s[1:]
else:
break
if s[-1] == ' ':
s = s[:-1]
return s
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cacaty
while len(s) > 0:
if s[0] == ' ':
s = s[1:]
else:
break
while len(s) > 0:
if s[-1] == ' ':
s = s[:-1]
else:
break
return s