Initial commit: Go project with greet function and CLI

pkg/greet/greet.go

@@ -0,0 +1,10 @@
+package greet
+
+// Greet returns a greeting message for the given name.
+// If name is empty, it defaults to "world".
+func Greet(name string) string {
+	if name == "" {
+		return "Hello world!"
+	}
+	return "Hello " + name + "!"
+}

pkg/greet/greet_test.go

@@ -0,0 +1,24 @@
+package greet
+
+import "testing"
+
+func TestGreet(t *testing.T) {
+	tests := []struct {
+		name     string
+		expected string
+	}{
+		{"", "Hello world!"},
+		{"John", "Hello John!"},
+		{"Alice", "Hello Alice!"},
+		{"  ", "Hello   !"}, // spaces are not considered empty
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := Greet(tt.name)
+			if result != tt.expected {
+				t.Errorf("Greet(%q) = %q, want %q", tt.name, result, tt.expected)
+			}
+		})
+	}
+}