code: def find_exact(self, prefix):
          '''
          Find the exact child with the given prefix
          '''
          matches = self.find_all(prefix)
          if len(matches) == 1:
              match = matches.pop()
              if match.prefix == prefix:
                  return match
  
          return Nonf find_exact(self, prefix):
          '''
          Find the exact child with the given prefix
          '''
          matches = self.find_all(prefix)
          if len(matches) == 1:
              match = matches.pop()
              if match.prefix == prefix:
                  return match
  
          return None
docs: Find the exact child with the given prefix