done :)

.gitignore

@@ -34,3 +34,5 @@ yarn-error.log*
 # typescript
 *.tsbuildinfo
 next-env.d.ts
+
+.prettierrc

lib/vikings.ts

@@ -0,0 +1,35 @@
+import {Viking,VikingJson,VikingYaml} from "../types/vikingTypes"
+
+function JsonToViking(vikingJson: VikingJson[]){
+    return vikingJson.map((el)=>{
+        return{
+            fullName: el.fullName,
+            hometown: el.village,
+            age: el.age,
+            presenceOfChildren: el.hasSon
+        }
+    })
+}
+
+function YamlToViking(vikingYaml: VikingYaml[]){
+    return vikingYaml.map((el)=>{
+        return{
+            fullName: el.name,
+            hometown: el.has_home_in,
+            age: el.years_old,
+            presenceOfChildren: el.number_of_children > 0 ? true : false,
+            canFightWithSword: el.weapon === "sword" ? true : false,
+            canFightWithSpear: el.weapon === "spear" ? true : false,
+            canFightWithAxe: el.weapon === "axe" ? true : false
+        }
+    })
+}
+
+
+export default function getVikings(vikingsJson: VikingJson[], vikingsYaml: VikingYaml[]){
+    const vikingsFromJson = JsonToViking(vikingsJson) as Viking[]
+    const vikingsFromYaml = YamlToViking(vikingsYaml) as Viking[]
+
+    return [...vikingsFromJson, ...vikingsFromYaml].filter(el => el.age >= 25 && el.age <=65)
+
+}

module.d.ts

@@ -0,0 +1,4 @@
+declare module "*.yaml" {
+    const data: { [key: string]: any };
+    export default data;
+  }

next.config.js

@@ -3,5 +3,7 @@ const nextConfig = {
   reactStrictMode: true,
   swcMinify: true,
 }
+const nextYaml = require("next-yaml")
 
 module.exports = nextConfig
+module.exports = nextYaml