enhance: only alloc temp buffer once time (#597)

Signed-off-by: leo <[email protected]>

Author: love-linger

src/Models/NumericSort.cs

@@ -10,21 +10,20 @@ public static int Compare(string s1, string s2)
             int marker1 = 0;
             int marker2 = 0;
 
+            char[] tmp1 = new char[len1];
+            char[] tmp2 = new char[len2];
+
             while (marker1 < len1 && marker2 < len2)
             {
                 char c1 = s1[marker1];
                 char c2 = s2[marker2];
-
-                char[] space1 = new char[len1];
-                char[] space2 = new char[len2];
-
                 int loc1 = 0;
                 int loc2 = 0;
 
                 bool isDigit1 = char.IsDigit(c1);
                 do
                 {
-                    space1[loc1] = c1;
+                    tmp1[loc1] = c1;
                     loc1++;
                     marker1++;
 
@@ -37,7 +36,7 @@ public static int Compare(string s1, string s2)
                 bool isDigit2 = char.IsDigit(c2);
                 do
                 {
-                    space2[loc2] = c2;
+                    tmp2[loc2] = c2;
                     loc2++;
                     marker2++;
 
@@ -47,9 +46,8 @@ public static int Compare(string s1, string s2)
                         break;
                 } while (char.IsDigit(c2) == isDigit2);
 
-                string sub1 = new string(space1, 0, loc1);
-                string sub2 = new string(space2, 0, loc2);
-
+                string sub1 = new string(tmp1, 0, loc1);
+                string sub2 = new string(tmp2, 0, loc2);
                 int result;
                 if (isDigit1 && isDigit2)
                 {