feat: add stringx.ToCamelCase (#2622)

core/stringx/strings.go

@@ -2,6 +2,7 @@ package stringx
 
 import (
 	"errors"
+	"unicode"
 
 	"github.com/zeromicro/go-zero/core/lang"
 )
@@ -168,6 +169,15 @@ func TakeWithPriority(fns ...func() string) string {
 	return ""
 }
 
+// ToCamelCase returns the string that converts the first letter to lowercase.
+func ToCamelCase(s string) string {
+	for i, v := range s {
+		return string(unicode.ToLower(v)) + s[i+1:]
+	}
+
+	return ""
+}
+
 // Union merges the strings in first and second.
 func Union(first, second []string) []string {
 	set := make(map[string]lang.PlaceholderType)