feat: add rust solution to lc problem: No.0917

No.0917.Reverse Only Letters

Author: YangFong

solution/0900-0999/0917.Reverse Only Letters/README.md

@@ -178,6 +178,31 @@ func reverseOnlyLetters(s string) string {
 }
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn reverse_only_letters(s: String) -> String {
+        let mut cs: Vec<char> = s.chars().collect();
+        let n = cs.len();
+        let mut l = 0;
+        let mut r = n - 1;
+        while l < r {
+            if !cs[l].is_ascii_alphabetic() {
+                l += 1;
+            } else if !cs[r].is_ascii_alphabetic() {
+                r -= 1;
+            } else {
+                cs.swap(l, r);
+                l += 1;
+                r -= 1;
+            }
+        }
+        cs.iter().collect()
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0900-0999/0917.Reverse Only Letters/README_EN.md

@@ -146,6 +146,31 @@ func reverseOnlyLetters(s string) string {
 }
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn reverse_only_letters(s: String) -> String {
+        let mut cs: Vec<char> = s.chars().collect();
+        let n = cs.len();
+        let mut l = 0;
+        let mut r = n - 1;
+        while l < r {
+            if !cs[l].is_ascii_alphabetic() {
+                l += 1;
+            } else if !cs[r].is_ascii_alphabetic() {
+                r -= 1;
+            } else {
+                cs.swap(l, r);
+                l += 1;
+                r -= 1;
+            }
+        }
+        cs.iter().collect()
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0900-0999/0917.Reverse Only Letters/Solution.rs

@@ -0,0 +1,20 @@
+impl Solution {
+    pub fn reverse_only_letters(s: String) -> String {
+        let mut cs: Vec<char> = s.chars().collect();
+        let n = cs.len();
+        let mut l = 0;
+        let mut r = n - 1;
+        while l < r {
+            if !cs[l].is_ascii_alphabetic() {
+                l += 1;
+            } else if !cs[r].is_ascii_alphabetic() {
+                r -= 1;
+            } else {
+                cs.swap(l, r);
+                l += 1;
+                r -= 1;
+            }
+        }
+        cs.iter().collect()
+    }
+}