docs: add the duplicates into the doc

README.md

@@ -196,7 +196,7 @@ The corresponding chained function is `collect.UseSlice()`
 
   </details>
 
-- `Unique` removes duplicate elements from slices
+- `Unique` removes duplicate elements in the slice
 
   <details>
   <summary>Examples</summary>
@@ -208,6 +208,18 @@ The corresponding chained function is `collect.UseSlice()`
 
   </details>
 
+- `Duplicates` gets the duplicate elements in the slice
+
+  <details>
+  <summary>Examples</summary>
+
+  ```go
+  d := []string{"a", "b", "a", "c"}
+  collect.Duplicates(d)  // map[int]string{2: "a"}
+  ```
+
+  </details>
+
 - `Merge` merges the current slice with other slices
 
   <details>
@@ -830,7 +842,7 @@ Due to Golang's support for generics, it is [not possible to define generic type
 
   </details>
 
-- `Times` creates a new collection of slices by calling the callback with specified number of times
+- `Times` creates a new collection of slice by calling the callback with specified number of times
 
   <details>
   <summary>Examples</summary>

README_zh-CN.md

@@ -208,6 +208,18 @@ import collect "github.com/sxyazi/go-collection"
 
   </details>
 
+- Duplicates：获取切片中的重复元素
+
+  <details>
+  <summary>例子</summary>
+
+  ```go
+  d := []string{"a", "b", "a", "c"}
+  collect.Duplicates()  // map[int]string{2: "a"}
+  ```
+
+  </details>
+
 - Merge：将当前切片与其它切片合并
 
   <details>

converter.go

@@ -90,7 +90,7 @@ func OffsetToIndex(actual, offset int, args ...int) (int, int) {
 	return offset, offset + length
 }
 
-func NumberFrom[N constraints.Integer | constraints.Float, T ~[]E, E comparable](c *SliceCollection[T, E]) *NumberCollection[[]N, N] {
+func NumberFrom[N constraints.Integer | constraints.Float, T ~[]E, E any](c *SliceCollection[T, E]) *NumberCollection[[]N, N] {
 	if c.Empty() {
 		return &NumberCollection[[]N, N]{}
 	}

functional.go

@@ -567,7 +567,7 @@ func Count[T ~[]E, E comparable](items T) map[E]int {
 	return times
 }
 
-func Times[T ~[]E, E any](number int, callback func(number int) E) *SliceCollection[T, E] {
+func Times[T []E, E any](number int, callback func(number int) E) *SliceCollection[T, E] {
 	items := make(T, number)
 	for i := 0; i < number; i++ {
 		items[i] = callback(i + 1)

tests/slice_test.go

@@ -254,6 +254,9 @@ func TestSlice_Duplicates(t *testing.T) {
 	if !UseSlice([]int{1, 2, 2, 3}).Duplicates().Same(map[int]int{2: 2}) {
 		t.Fail()
 	}
+	if !UseSlice([]string{"a", "b", "a", "c"}).Duplicates().Same(map[int]string{2: "a"}) {
+		t.Fail()
+	}
 
 	s1, s2 := []int{1, 2, 3}, []int{4, 5, 6}
 	if !UseSlice([][]int{s1, s2, s1}).Duplicates().Same(map[int][]int{2: s1}) {

tests/types.go

@@ -1,7 +1,7 @@
 package tests
 
 type Foo struct {
-	Bar any
+	Bar string
 }
 
 type User struct {