javagit/src/main/java/edu/nyu/cs/javagit/client/cli/CliGitCheckout.java
public GitCheckoutResponse checkout(File repositoryPath) throws JavaGitException, IOException {
        GitCheckoutOptions options = null;
        return checkout(repositoryPath, options, null);
    }
public GitCheckoutResponse checkout(File repositoryPath) throws JavaGitException, IOException {
        GitCheckoutOptions options = null;
        return checkout(repositoryPath, options, null);
    }
Git checkout without any options and branch information provided. Just a basic checkout
command.