Сценарий: Преобразование fmt.Sprint() -> std::to_string()

pkg/service/features/app.feature

@@ -543,4 +543,25 @@ Serial.println("Connecting ...");
 Serial.println("Connected!");
 }
 void loop() {}
+```
+
+  Сценарий: Преобразование fmt.Sprint() -> std::to_string()
+    * Исходник:
+```
+package test
+
+func Setup() {
+  a := ""
+  a += fmt.Sprint(5)
+  a += "A " + fmt.Sprint(19) + " A " + fmt.Sprint(a)
+}
+```
+    * Результат:
+```
+void setup();
+void setup() {
+std::string a="";
+a+=std::to_string(5);
+a+="A "+std::to_string(19)+" A "+std::to_string(a);
+}
 ```

pkg/service/func.go

@@ -112,16 +112,15 @@ func handleFuncDeclType(t *ast.FuncType) string {
 	return code
 }
 
-func handleFuncDeclName(ident *ast.Ident) string {
-	code := ""
+func handleFuncDeclName(ident *ast.Ident) (code string) {
 	if ident == nil {
-		return code
+		return
 	}
 	code += ident.Name
 	if val, ok := mapping[code]; ok {
 		code = val
 	}
-	return code
+	return
 }
 
 func handleFuncDeclParams(t *ast.FuncType) string {

pkg/service/mapping.go

@@ -1,6 +1,7 @@
 package service
 
 var mapping = map[string]string{
+	"fmt.Sprint":                     "std::to_string",
 	"digital.Low":                    "LOW",
 	"digital.High":                   "HIGH",
 	"digital.ModeInput":              "INPUT",