添加 0344.反转字符串.md C语言版本

problems/0344.反转字符串.md

@@ -218,7 +218,19 @@ func reverseString(_ s: inout [Character]) {
 }
 ```
 
+C:
+```c
+void reverseString(char* s, int sSize){
+    int left = 0;
+    int right = sSize - 1;
 
+    while(left < right) {
+        char temp = s[left];
+        s[left++] = s[right];
+        s[right--] = temp;
+    }
+}
+```
 
 
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