Strutil: HammingDistance func (#197)

* Strutil: HammingDistance func

The Hamming distance is the number of positions at which the corresponding symbols are different

* Add hamming distance doc

docs/api/packages/strutil.md

@@ -61,6 +61,7 @@ import (
 -   [ContainsAny](#ContainsAny)
 -   [RemoveWhiteSpace](#RemoveWhiteSpace)
 -   [SubInBetween](#SubInBetween)
+-   [HammingDistance](#HammingDistance)
 
 <div STYLE="page-break-after: always;"></div>
 
@@ -1495,4 +1496,36 @@ func main() {
     // abc
     // bc
 }
+```
+
+### <span id="HammingDistance">HammingDistance</span>
+
+<p>TBD</p>
+
+<b>函数签名:</b>
+
+```go
+HammingDistance(a, b string) (int, error)
+```
+
+<b>示例:</b>
+
+```go
+import (
+    "fmt"
+    "github.com/duke-git/lancet/v2/strutil"
+)
+
+func main() {
+
+    result1, _ := strutil.HammingDistance("de", "de")
+    result2, _ := strutil.HammingDistance("a", "d")
+
+    fmt.Println(result1)
+    fmt.Println(result2)
+
+    // Output:
+    // 0
+    // 1
+}
 ```