fix: use strings.Builder

In the ConvertBigIntArrayToString function, the big.Int is first converted to a string and then concatenated with commas. This can be optimized using strings.Builder, which avoids creating new string objects on each concatenation. The performance advantage is particularly significant when dealing with larger arrays.

bridge-history-api/internal/utils/utils.go

@@ -172,13 +172,14 @@ func GetBlocksInRange(ctx context.Context, cli *ethclient.Client, start, end uin
 
 // ConvertBigIntArrayToString convert the big int array to string
 func ConvertBigIntArrayToString(array []*big.Int) string {
-	stringArray := make([]string, len(array))
+	var sb strings.Builder
 	for i, num := range array {
-		stringArray[i] = num.String()
+		if i > 0 {
+			sb.WriteString(", ")
+		}
+		sb.WriteString(num.String())
 	}
-
-	result := strings.Join(stringArray, ", ")
-	return result
+	return sb.String()
 }
 
 // ConvertStringToStringArray takes a string with values separated by commas and returns a slice of strings