input: Write a python function to convert a list of strings into a single string with spaces in between.
  assert listOfStringsToString(["This", "is", "an", "example"]) == "This is an example"
  assert listOfStringsToString(["Hello", "world"]) == "Hello world"
  assert listOfStringsToString(["Python", "is", "fun"]) == "Python is fun"
output: def listOfStringsToString(strings):
      return ' '.join(strings)