feat: add rust solution to lc problem: No.2553 (#1226)

Author: dierbei

solution/2500-2599/2553.Separate the Digits in an Array/README.md

@@ -176,6 +176,30 @@ impl Solution {
 }
 ```
 
+```rust
+impl Solution {
+    pub fn separate_digits(nums: Vec<i32>) -> Vec<i32> {
+        let mut ans = vec![];
+
+        for n in nums {
+            let mut t = vec![];
+            let mut x = n; 
+
+            while x != 0 {
+                t.push(x % 10);
+                x /= 10;
+            }
+
+            for i in (0..t.len()).rev() {
+                ans.push(t[i]);
+            }
+        }
+
+        ans
+    }
+}
+```
+
 ### **C**
 
 ```c

solution/2500-2599/2553.Separate the Digits in an Array/README_EN.md

@@ -162,6 +162,30 @@ impl Solution {
 }
 ```
 
+```rust
+impl Solution {
+    pub fn separate_digits(nums: Vec<i32>) -> Vec<i32> {
+        let mut ans = vec![];
+
+        for n in nums {
+            let mut t = vec![];
+            let mut x = n; 
+
+            while x != 0 {
+                t.push(x % 10);
+                x /= 10;
+            }
+
+            for i in (0..t.len()).rev() {
+                ans.push(t[i]);
+            }
+        }
+
+        ans
+    }
+}
+```
+
 ### **C**
 
 ```c