use string conversion for countdigits

flow/datatypes/bigint.go

@@ -1,41 +1,12 @@
 package datatypes
 
 import (
-	"math"
 	"math/big"
 )
 
-var tenInt = big.NewInt(10)
-
 func CountDigits(bi *big.Int) int {
-	tenInt := big.NewInt(10)
-	if bi.IsUint64() {
-		u64 := bi.Uint64()
-		if u64 < (1 << 53) { // Check if it is less than 2^53
-			if u64 == 0 {
-				return 1 // 0 has one digit
-			}
-			return int(math.Log10(float64(u64))) + 1
-		}
-	} else if bi.IsInt64() {
-		i64 := bi.Int64()
-		if i64 > -(1 << 53) { // Check if it is greater than -2^53
-			if i64 == 0 {
-				return 1 // 0 has one digit
-			}
-			return int(math.Log10(float64(-i64))) + 1
-		}
+	if bi.Sign() < 0 {
+		return len(bi.String()) - 1
 	}
-
-	// For larger numbers, use the bit length and logarithms
-	abs := new(big.Int).Abs(bi)
-	lg10 := int(float64(abs.BitLen()) / math.Log2(10))
-
-	// Verify and adjust lg10 if necessary
-	check := new(big.Int).Exp(tenInt, big.NewInt(int64(lg10)), nil)
-	if abs.Cmp(check) >= 0 {
-		lg10++
-	}
-
-	return lg10
+	return len(bi.String())
 }