fix: prefix match is not quite correct.

fix #229

docs/plugins/create/howto.md

@@ -153,6 +153,10 @@ end
 
 ## Optional hook functions
 
+::: warning
+You must delete the corresponding `.lua` file if you do not need these hook functions!
+:::
+
 ### PostInstall
 
 This hook function is called after the `PreInstall` function is executed. It is used to execute additional operations,

docs/zh-hans/plugins/create/howto.md

@@ -147,6 +147,10 @@ end
 
 ## 可选钩子函数
 
+::: warning
+如果不需要这些钩子函数，请**删除对应的`.lua`文件**!
+::: 
+
 ### PostInstall
 
 拓展点，在`PreInstall`执行之后调用，用于执行额外的操作， 如编译源码等。根据需要实现。

internal/sdk.go

@@ -254,9 +254,10 @@ func (b *Sdk) PreUse(version Version, scope UseScope) (Version, error) {
 			installedVersions = append(installedVersions, string(sdk.Main.Version))
 		}
 		sort.Sort(installedVersions)
-		prefix := string(version)
+		version := string(version)
+		prefix := version + "."
 		for _, v := range installedVersions {
-			if prefix == v {
+			if version == v {
 				newVersion = Version(v)
 				break
 			}
@@ -266,6 +267,9 @@ func (b *Sdk) PreUse(version Version, scope UseScope) (Version, error) {
 			}
 		}
 	}
+	if newVersion == "" {
+		return version, nil
+	}
 
 	return newVersion, nil
 }