style: format code and docs with prettier

Author: yanglbme

lcof/面试题50. 第一个只出现一次的字符/README.md

@@ -200,17 +200,17 @@ class Solution {
     func firstUniqChar(_ s: String) -> Character {
         var count = [Int](repeating: 0, count: 26)
         let aAsciiValue = Int(Character("a").asciiValue!)
-        
+
         for char in s {
             count[Int(char.asciiValue!) - aAsciiValue] += 1
         }
-        
+
         for char in s {
             if count[Int(char.asciiValue!) - aAsciiValue] == 1 {
                 return char
             }
         }
-        
+
         return " "
     }
 }