feat(Str): Added method to get_data

This method sends link of label _data from strict

src/string/my_str_strict.rs

@@ -32,4 +32,8 @@ impl Str {
             _capacity: SIZE,
         };
     }
+
+    pub fn get_data(&self) -> &Vec<char> {
+        return &self._data;
+    }
 }