comefrom: <doocs>1392.Longest Happy Prefix_1.py
code: def longestPrefix( s: str) -> str:
      for i in range(1, len(s)):
          if s[:-i] == s[i:]:
              return s[i:]
      return ''
masked: def sample_funcname ( var_0 : str ) -> str :
      for var_5 in range ( 1 , len ( var_0 ) ) :
          if var_0 [ : - var_5 ] == var_0 [ var_5 : ] :
              return var_0 [ var_5 : ]
      return ''
  