update readme

src/functional-programing/cloure.md

@@ -1,51 +0,0 @@
-# Closure
-
-下面代码是Rust圣经课程中[闭包](http://course.rs/advance/functional-programing/closure.html#结构体中的闭包)章节的课内练习题答案：
-
-```rust
-struct Cacher<T,E>
-where
-    T: Fn(E) -> E,
-    E: Copy
-{
-    query: T,
-    value: Option<E>,
-}
-
-impl<T,E> Cacher<T,E>
-where
-    T: Fn(E) -> E,
-    E: Copy
-{
-    fn new(query: T) -> Cacher<T,E> {
-        Cacher {
-            query,
-            value: None,
-        }
-    }
-
-    fn value(&mut self, arg: E) -> E {
-        match self.value {
-            Some(v) => v,
-            None => {
-                let v = (self.query)(arg);
-                self.value = Some(v);
-                v
-            }
-        }
-    }
-}
-fn main() {
-  
-}
-
-#[test]
-fn call_with_different_values() {
-    let mut c = Cacher::new(|a| a);
-
-    let v1 = c.value(1);
-    let v2 = c.value(2);
-
-    assert_eq!(v2, 1);
-}
-```

src/functional-programing/intro.md

@@ -1 +0,0 @@
-# Functional programing

src/functional-programing/iterator.md

@@ -1 +0,0 @@
-# Iterator