feat(Str): Strict impemintation

Added method new() for creating empty string

src/string/MyStr_strict.rs

@@ -12,3 +12,20 @@ pub struct Str {
     _size: usize,
     _capacity: usize,
 }
+
+impl Str {
+    pub fn new() -> Self {
+        Self {
+            _data: Vec::with_capacity(SIZE),
+            _stats: {
+                let mut data = Vec::new();
+                for i in 0..SIZE {
+                    data.push(Status::FREE);
+                }
+                data
+            },
+            _size: 0,
+            _capacity: SIZE,
+        }
+    }
+}