feat: add even number problem

.github/workflows/go.yaml

@@ -17,4 +17,4 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Test
-        run: go test -race -v -bench=. ./...
+        run: go test -race -v ./...

camelcase/camelcase.go

@@ -3,4 +3,3 @@ package camelcase
 func Camelcase(s string) string {
 	return s
 }
-

even/even.go

@@ -0,0 +1,5 @@
+package even
+
+func isEven(n int) bool {
+	return n%2 == 0
+}

even/even_test.go

@@ -0,0 +1,22 @@
+package even
+
+import "testing"
+
+func TestEven(t *testing.T) {
+	suite := map[int]bool{
+		2:                  true,
+		1:                  false,
+		824:                true,
+		200:                true,
+		52:                 true,
+		1785616589187:      false,
+		0:                  true,
+		100000000000000000: true,
+	}
+
+	for k, v := range suite {
+		if output := isEven(k); output != v {
+			t.Errorf("input: %d - expected: %v, got: %v", k, v, output)
+		}
+	}
+}

even/readme.txt

@@ -0,0 +1,6 @@
+Given a number N, return a boolean that tells whether N is a even number or not.
+
+Example:
+
+isEven(2) = true
+isEven(7) = false