Improved task 709.

Author: javadev

src/main/java/g0701_0800/s0709_to_lower_case/Solution.java

@@ -4,6 +4,12 @@
 
 public class Solution {
  public String toLowerCase(String s) {
- return s.toLowerCase();
+ char[] c = s.toCharArray();
+ for (int i = 0; i < s.length(); i++) {
+ if (c[i] <= 'Z' && c[i] >= 'A') {
+ c[i] = (char) (c[i] - 'A' + 'a');
+ }
+ }
+ return new String(c);
  }
 }