Update

prime.md

@@ -105,20 +105,20 @@ int isPrime(int n)
 {
   if (n < 4)
     return n > 1;
-    
+
   if (n % 2 == 0 || n % 3 == 0)
     return 0;
-    
+
   int test = 6;
-  
+
   while (test <= n / 2) // replace n / 2 by sqrt(n) if available
   {
     if (n % (test + 1) == 0 || n % (test - 1) == 0)
       return 0;
-      
+
     test += 6;
   }
-  
+
   return 1;
 }
 ```