fix: cli.CLIOptions is repetitive

internal/cli/arguments.go

@@ -6,7 +6,7 @@ import (
 )
 
 // Arguments given to program.
-type CLIOptions struct {
+type Options struct {
 	// The source code given to the program.
 	Input string
 	// Whether or not to print debug logs.
@@ -16,7 +16,7 @@ type CLIOptions struct {
 }
 
 // Extract the program configuration from the command-line arguments.
-func ParseOptions() (*CLIOptions, error) {
+func ParseOptions() (*Options, error) {
 	// Parse flags.
 	verbose := flag.Bool("v", false, "Verbosity. If set, the program will print logs.")
 	explanation := flag.Bool("x", false, "Explanation. Whether or not to show all reduction steps.")
@@ -29,7 +29,7 @@ func ParseOptions() (*CLIOptions, error) {
 		return nil, fmt.Errorf("More than 1 command-line argument.")
 	}
 
-	return &CLIOptions{
+	return &Options{
 		Input:       flag.Arg(0),
 		Verbose:     *verbose,
 		Explanation: *explanation,