TernaryOperator Reduce if else operations (#56)

* feat:(slice add AppendIfAbsent function)

* feat:(slice add TernaryOperator function)

Co-authored-by: george.zheng <george.zheng@ambergroup.io>

common/common_test.go

@@ -0,0 +1,14 @@
+package common
+
+import (
+	"github.com/duke-git/lancet/v2/internal"
+	"testing"
+)
+
+func TestTernaryOperator(t *testing.T) {
+	assert := internal.NewAssert(t, "TernaryOperator")
+	trueValue := "1"
+	falseValue := "0"
+
+	assert.Equal(trueValue, TernaryOperator(true, trueValue, falseValue))
+}