Add Storage key-value generic implementation

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

@@ -3,17 +3,50 @@
 import core.basesyntax.Storage;
 
 public class StorageImpl<K, V> implements Storage<K, V> {
+    private static final int MAX_SIZE = 10;
+    private final Object[] keys;
+    private final Object[] values;
+    private int size;
+
+    public StorageImpl() {
+        keys = new Object[MAX_SIZE];
+        values = new Object[MAX_SIZE];
+        size = 0;
+    }
+
     @Override
     public void put(K key, V value) {
+        int index = findKeyIndex(key);
+        if (index != -1) {
+            values[index] = value;
+            return;
+        }
+        keys[size] = key;
+        values[size] = value;
+        size++;
     }
 
     @Override
+    @SuppressWarnings("unchecked")
     public V get(K key) {
+        int index = findKeyIndex(key);
+        if (index != -1) {
+            return (V) values[index];
+        }
         return null;
     }
 
     @Override
     public int size() {
+        return size;
+    }
+
+    private int findKeyIndex(K key) {
+        for (int i = 0; i < size; i++) {
+            if (key == keys[i] || key != null && key.equals(keys[i])) {
+                return i;
+            }
+        }
         return -1;
     }
 }