Add storage impl

src/main/java/core/basesyntax/impl/StorageImpl.java

@@ -1,19 +1,48 @@
 package core.basesyntax.impl;
 
 import core.basesyntax.Storage;
+import java.util.Objects;
 
 public class StorageImpl<K, V> implements Storage<K, V> {
+    private static final int MAX_SIZE = 10;
+    private K[] keys = (K[]) new Object[10];
+    private V[] values = (V[]) new Object[10];
+    private int size = 0;
+
     @Override
     public void put(K key, V value) {
+        if (getIndex(key) >= 0) {
+            values[getIndex(key)] = value;
+        } else {
+            size++;
+            if (size > MAX_SIZE) {
+                throw new RuntimeException("Can't add new element. Maximum size reached.");
+            }
+            keys[size - 1] = key;
+            values[size - 1] = value;
+        }
     }
 
     @Override
     public V get(K key) {
+        int index = getIndex(key);
+        if (index >= 0) {
+            return values[index];
+        }
         return null;
     }
 
     @Override
     public int size() {
+        return size;
+    }
+
+    private int getIndex(K key) {
+        for (int i = 0; i < size; i++) {
+            if (Objects.equals(key, keys[i])) {
+                return i;
+            }
+        }
         return -1;
     }
 }