refactoring: move logic in different files

config.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	Default    string            `yaml:"default"`
+	Workspaces map[string]string `yaml:"workspaces"`
+}
+
+func LoadConfiguration(file string) (Config, error) {
+	data, err := os.ReadFile(os.Args[1])
+	config := Config{}
+
+	if err != nil {
+		return config, err
+	}
+
+	err = yaml.Unmarshal(data, &config)
+
+	if err != nil {
+		return config, err
+	}
+
+	return config, nil
+}