input: Write a python function to generate a black and white scatter plot using random coordinates.
  assert type(generate_scatter_plot()) == type(None)
  assert plt.gca().collections[0].get_offsets().shape == (100, 2)
output: import matplotlib.pyplot as plt
  import numpy as np
  
  def generate_scatter_plot():
      x = np.random.rand(100)
      y = np.random.rand(100)
      plt.scatter(x, y, c='black')
      plt.show()