input: Write a python function to create a bar chart from given countries and populations using matplotlib.
  assert create_bar_chart(["China", "India", "United States"], [143804000, 1351300000, 332500000]) is None
output: def create_bar_chart(countries, populations):
      import matplotlib.pyplot as plt
      
      plt.bar(countries, populations)
      plt.xlabel('Countries')
      plt.ylabel('Population')
      plt.title('Population of Countries')
      plt.show()