Create solution.rs

Author: wlgq2

415.add_string/solution.rs

@@ -0,0 +1,41 @@
+impl Solution 
+{
+    pub fn add_strings(mut num1: String,mut num2: String) -> String 
+    {
+    	let mut temp = String::new();
+    	let mut v:u8 = 0;
+    	loop
+    	{
+    		let v1 = num1.pop();
+    		let v2 = num2.pop();
+    		if v1 == None && v2 == None && v ==0
+    		{
+    			break;
+    		}
+    		if let Some(v1) = v1
+    		{
+    			v += v1 as u8 - 48;
+    		}
+    		if let Some(v2) = v2
+    		{
+    			v+= v2 as u8 - 48;
+    		}
+    		let v3:u8 = v%10;
+    		temp.push_str(&(v3.to_string())); 
+    		v /= 10;
+    	}
+    	let mut rst = String::new();
+    	loop
+        {
+        	if let Some(ch) = temp.pop()
+        	{
+        		rst.push(ch);
+        	}
+        	else 
+        	{
+        		break;
+        	}
+    	}
+        return rst;
+    }
+}