#2

main.go

@@ -1,9 +1,24 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
 func main() {
 
 	fmt.Println("Hello, World!")
 
 }
+
+func cleanInput(text string) []string {
+	// trim input string
+	text = strings.TrimSpace(text)
+	// convert to lowercase
+	text = strings.ToLower(text)
+	// replace all double spaces into single space
+	text = strings.Replace(text, "  ", " ", -1)
+	// split by space
+	separated := strings.Split(text, " ")
+	return separated
+}

main_test.go

@@ -0,0 +1,34 @@
+package main
+
+import "testing"
+
+func TestCleanInput(t *testing.T) {
+	cases := []struct {
+		input    string
+		expected []string
+	}{
+		{
+			input:    "  hello  world  ",
+			expected: []string{"hello", "world"},
+		},
+		{
+			input:    "Charmander Bulbasaur PIKACHU",
+			expected: []string{"charmander", "bulbasaur", "pikachu"},
+		},
+	}
+
+	for _, c := range cases {
+		actual := cleanInput(c.input)
+
+		if len(actual) != len(c.expected) {
+			t.Errorf("cleanInput(%q) == %q, want %q", c.input, actual, c.expected)
+		}
+		for i := range actual {
+			word := actual[i]
+			expectedWord := c.expected[i]
+			if word != expectedWord {
+				t.Errorf("cleanInput(%q) == %q, want %q", c.input, word, expectedWord)
+			}
+		}
+	}
+}