input: def removeDuplicates(arr):
      """Remove all duplicate elements from a given array of strings and return the resulting array.
      >>> removeDuplicates(['a', 'b', 'a', 'c', 'c', 'd'])
      ['a', 'b', 'c', 'd']
      """
      result = []
      
      # traverse for all elements 
      for i in arr: 
          
          # check if exists in result 
          if i not in result: 
              result.append(i)
      
      # return result 
      return result
output:     result = []
      
      # traverse for all elements 
      for i in arr: 
          
          # check if exists in result 
          if i not in result: 
              result.append(i)
      
      # return result 
      return result