input: Write a python function to create a bar chart from a list of tuples using matplotlib.
  assert create_bar_chart([[1, 20], [2, 30], [3, 25], [4, 10]]) == None
  assert create_bar_chart([[5, 50], [6, 60], [7, 45], [8, 70]]) == None
output: def create_bar_chart(data):
      import matplotlib.pyplot as plt
  
      x, y = zip(*data)
      plt.bar(x, y)
      plt.xlabel('X-axis')
      plt.ylabel('Y-axis')
      plt.title('Bar Chart')
      plt.show()