input: Write a python function to prepend a given string to each element in a list.
  assert prepend_string(['digger', 'dog', 'deer'], 'The') == ['The digger', 'The dog', 'The deer']
  assert prepend_string(['apple', 'banana', 'cherry'], 'Fruit:') == ['Fruit: apple', 'Fruit: banana', 'Fruit: cherry']
  assert prepend_string(['table', 'chair'], 'Furniture:') == ['Furniture: table', 'Furniture: chair']
output: def prepend_string(lst, string):
      return [f"{string} {item}" for item in lst]