feat：开发新的方法 (#74)

ExtractKeys 切片字段提取
SliceToMap 切片转map

sliceUtil/slice_to_map_example_test.go

@@ -0,0 +1,26 @@
+package sliceUtil
+
+import "fmt"
+
+// ExampleSliceToMap 演示了 SliceToMap 函数的用法
+func ExampleSliceToMap() {
+	type Person struct {
+		ID   int
+		Name string
+	}
+
+	people := []Person{
+		{ID: 1, Name: "Alice"},
+		{ID: 2, Name: "Bob"},
+		{ID: 3, Name: "Charlie"},
+	}
+
+	keyFunc := func(p Person) int {
+		return p.ID
+	}
+
+	peopleMap := SliceToMap(people, keyFunc)
+	fmt.Println(peopleMap)
+	// Output:
+	// map[1:{1 Alice} 2:{2 Bob} 3:{3 Charlie}]
+}