fix incorrect transaction amount in exported data

pkg/utils/converter.go

@@ -94,3 +94,32 @@ func Float64ToString(num float64) string {
 func StringToFloat64(str string) (float64, error) {
 	return strconv.ParseFloat(str, 64)
 }
+
+// FormatAmount returns a textual representation of amount
+func FormatAmount(amount int64) string {
+	displayAmount := Int64ToString(amount)
+	negative := displayAmount[0] == '-'
+
+	if negative {
+		displayAmount = displayAmount[1:]
+	}
+
+	integer := SubString(displayAmount, 0, len(displayAmount)-2)
+	decimals := SubString(displayAmount, -2, 2)
+
+	if integer == "" {
+		integer = "0"
+	}
+
+	if len(decimals) == 0 {
+		decimals = "00"
+	} else if len(decimals) == 1 {
+		decimals = "0" + decimals
+	}
+
+	if negative {
+		return "-" + integer + "." + decimals
+	}
+
+	return integer + "." + decimals
+}

pkg/utils/converter_test.go

@@ -122,3 +122,53 @@ func TestStringToFloat64(t *testing.T) {
 	assert.Equal(t, nil, err)
 	assert.Equal(t, expectedValue, actualValue)
 }
+
+func TestFormatAmount(t *testing.T) {
+	expectedValue := "0.00"
+	actualValue := FormatAmount(0)
+	assert.Equal(t, expectedValue, actualValue)
+
+	expectedValue = "0.00"
+	actualValue = FormatAmount(-0)
+	assert.Equal(t, expectedValue, actualValue)
+
+	expectedValue = "0.01"
+	actualValue = FormatAmount(1)
+	assert.Equal(t, expectedValue, actualValue)
+
+	expectedValue = "-0.01"
+	actualValue = FormatAmount(-1)
+	assert.Equal(t, expectedValue, actualValue)
+
+	expectedValue = "0.10"
+	actualValue = FormatAmount(10)
+	assert.Equal(t, expectedValue, actualValue)
+
+	expectedValue = "-0.10"
+	actualValue = FormatAmount(-10)
+	assert.Equal(t, expectedValue, actualValue)
+
+	expectedValue = "0.12"
+	actualValue = FormatAmount(12)
+	assert.Equal(t, expectedValue, actualValue)
+
+	expectedValue = "-0.12"
+	actualValue = FormatAmount(-12)
+	assert.Equal(t, expectedValue, actualValue)
+
+	expectedValue = "1.23"
+	actualValue = FormatAmount(123)
+	assert.Equal(t, expectedValue, actualValue)
+
+	expectedValue = "-1.23"
+	actualValue = FormatAmount(-123)
+	assert.Equal(t, expectedValue, actualValue)
+
+	expectedValue = "12.34"
+	actualValue = FormatAmount(1234)
+	assert.Equal(t, expectedValue, actualValue)
+
+	expectedValue = "-12.34"
+	actualValue = FormatAmount(-1234)
+	assert.Equal(t, expectedValue, actualValue)
+}