input: 
  def version_control(code: str) -> str:
      """
      Implement a basic version control system that keeps track of changes in the code.
      The function should return the latest version of the code after committing multiple changes.
  
      >>> version_control("initial code")
      '2: initial code'  # Assuming the function internally handles two commits.
      """
  
output:     versions = ["0: initial code"]
      versions.append(f"1: {code}")
      versions.append(f"2: {code}")
      return versions[-1]