Move examples to examples dir, now LoadJsonFile() also returns err

* Move examples from cmd to examples dir
* Update Makefile
* LoadJsonFile() dies in-place on read or parse error which is not correct
* LoadJsonFile() wastes Instance map, now it returns its own map and error if any

internal/doll/jsonfile.go

@@ -1,30 +1,30 @@
 package doll
 
 import (
-	"doll/internal/log"
 	"encoding/json"
+	"fmt"
 	"os"
 )
 
 // LoadJsonFile loads data from json to Instance global variable map.
-func LoadJsonFile(file string) map[string]any {
+func LoadJsonFile(file string) (map[string]any, error) {
 	var (
-		err  error
-		data []byte
+		err   error
+		data  []byte
+		myMap map[string]any
 	)
 
 	data, err = os.ReadFile(file)
 
 	if err != nil {
-		log.Fatalf("Unable to load %s: %s", file, err)
+		return myMap, fmt.Errorf("Unable to load %s: %w", file, err)
 	}
 
-	err = json.Unmarshal([]byte(data), &Instance)
-	if err != nil {
-		log.Fatalf("Unable to marshal JSON data from %s: %s", file, err)
+	if err = json.Unmarshal([]byte(data), &myMap); err != nil {
+		return myMap, fmt.Errorf("Unable to unmarshal JSON data from %s: %w", file, err)
 	}
 
-	return Instance
+	return myMap, err
 }
 
 /* vim: set ft=go noet ai ts=4 sw=4 sts=4: */