feat: add rust solution to lc problem: No.0443 (doocs#1606)

No.0443.String Compression

Author: poltao

solution/0400-0499/0443.String Compression/README.md

@@ -161,6 +161,34 @@ func compress(chars []byte) int {
 }
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn compress(chars: &mut Vec<char>) -> i32 {
+        let (mut i, mut k, n) = (0, 0, chars.len());
+        while i < n {
+            let mut j = i + 1;
+            while j < n && chars[j] == chars[i] {
+                j += 1;
+            }
+            chars[k] = chars[i];
+            k += 1;
+
+            if j - i > 1 {
+                let cnt = (j - i).to_string();
+                for c in cnt.chars() {
+                    chars[k] = c;
+                    k += 1;
+                }
+            }
+            i = j;
+        }
+        k as i32
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0400-0499/0443.String Compression/README_EN.md

@@ -148,6 +148,34 @@ func compress(chars []byte) int {
 }
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn compress(chars: &mut Vec<char>) -> i32 {
+        let (mut i, mut k, n) = (0, 0, chars.len());
+        while i < n {
+            let mut j = i + 1;
+            while j < n && chars[j] == chars[i] {
+                j += 1;
+            }
+            chars[k] = chars[i];
+            k += 1;
+
+            if j - i > 1 {
+                let cnt = (j - i).to_string();
+                for c in cnt.chars() {
+                    chars[k] = c;
+                    k += 1;
+                }
+            }
+            i = j;
+        }
+        k as i32
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0400-0499/0443.String Compression/Solution.rs

@@ -0,0 +1,23 @@
+impl Solution {
+    pub fn compress(chars: &mut Vec<char>) -> i32 {
+        let (mut i, mut k, n) = (0, 0, chars.len());
+        while i < n {
+            let mut j = i + 1;
+            while j < n && chars[j] == chars[i] {
+                j += 1;
+            }
+            chars[k] = chars[i];
+            k += 1;
+
+            if j - i > 1 {
+                let cnt = (j - i).to_string();
+                for c in cnt.chars() {
+                    chars[k] = c;
+                    k += 1;
+                }
+            }
+            i = j;
+        }
+        k as i32
+    }
+}