Sync LeetCode submission - Base 7 (rust)

Author: JMoogs

my-folder/problems/base_7/solution.rs

@@ -0,0 +1,23 @@
+impl Solution {
+    pub fn convert_to_base7(num: i32) -> String {
+        let negative = num.is_negative();
+        let mut num = num.abs() as u32;
+
+        let mut n = String::new();
+        if num == 0 {
+            return "0".into();
+        }
+
+        while num != 0 {
+            n.push(char::from_digit(num % 7, 10).unwrap());
+            num /= 7;
+        }
+
+        if negative {
+            n.push('-');
+        }
+
+        n.chars().rev().collect()
+    }
+
+}