add missing package

profiling/profile.go

@@ -1,25 +1,26 @@
 package profile
 
 import (
-    "time"
+	"log"
-    "log"
+	"math/big"
+	"time"
 )
 
 func Duration(invocation time.Time, name string) {
-    elapsed := time.Since(invocation)
+	elapsed := time.Since(invocation)
 
-    log.Printf("%s lasted %s", name, elapsed)
+	log.Printf("%s lasted %s", name, elapsed)
 }
 
 func BigIntFactorial(x big.Int) *big.Int {
-    // Arguments to a defer statement is immediately evaluated and stored.
+	// Arguments to a defer statement is immediately evaluated and stored.
-    // The deferred function receives the pre-evaluated values when its invoked.
+	// The deferred function receives the pre-evaluated values when its invoked.
-    defer Duration(time.Now(), "IntFactorial")
+	defer Duration(time.Now(), "IntFactorial")
 
-    y := big.NewInt(1)
+	y := big.NewInt(1)
-    for one := big.NewInt(1); x.Sign() > 0; x.Sub(x, one) {
+	for one := big.NewInt(1); x.Sign() > 0; x.Sub(x, one) {
-        y.Mul(y, x)
+		y.Mul(y, x)
-    }
+	}
 
-    return x.Set(y)
+	return x.Set(y)
 }