input: Write a python function to replace the word "Apple" with "Orange" in a given string.
  assert edit_string("Apple is a great fruit") == "Orange is a great fruit"
  assert edit_string("I have an Apple and an Apple pie") == "I have an Orange and an Orange pie"
  assert edit_string("Banana and Apple are fruits") == "Banana and Orange are fruits"
output: def edit_string(s):
      return s.replace("Apple", "Orange")