a=s
if len(a)>1:
if a[0]==' ':
a=a[1:]
if a[-1]==' 'and len(a)>1:
a=a[:-1]
if (a[0]==' 'or a[-1]==' ')and len(a)>1:
a=trim(a)
if len(a)==1 and a[0]==' ':
a=''
return a
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用户5096374623
a=s
if len(a)>1:
if a[0]==' ':
a=a[1:]
if a[-1]==' 'and len(a)>1:
a=a[:-1]
if (a[0]==' 'or a[-1]==' ')and len(a)>1:
a=trim(a)
if len(a)==1 and a[0]==' ':
a=''
return a