Added benchmark test

Makefile

@@ -2,3 +2,6 @@ test:
 	go test -coverprofile=coverage.out ./...
 	go tool cover -html=coverage.out -o coverage.html
 	rm coverage.out
+
+bench:
+	go test -bench=. -cpuprofile=cpu.out -memprofile=mem.out

api_test.go

@@ -5,8 +5,8 @@ import (
 	"testing"
 )
 
-func TestFatQRAPI(t *testing.T) {
-	input := "A:123456789*B:999999990*C:PT*D:FT*E:N*F:20191231*" +
+var (
+	completeInput = "A:123456789*B:999999990*C:PT*D:FT*E:N*F:20191231*" +
 		"G:FT AB2019/0035*H:CSDF7T5H-0035*I1:PT*I2:12000.00*I3:15000.00*" +
 		"I4:900.00*I5:50000.00*I6:6500.00*I7:80000.00*I8:18400.00*J1:PT-AC*" +
 		"J2:10000.00*J3:25000.56*J4:1000.02*J5:75000.00*J6:6750.00*" +
@@ -14,6 +14,10 @@ func TestFatQRAPI(t *testing.T) {
 		"K5:25000.00*K6:3000.00*K7:40000.00*K8:8800.00*L:100.00*M:25.00*" +
 		"N:64000.02*O:513600.58*P:100.00*Q:kLp0*R:9999*" +
 		"S:TB;PT00000000000000000000000;513500.58"
+)
+
+func TestFatQRAPI(t *testing.T) {
+	input := completeInput
 
 	var qr gofatqr.FatQR
 	err := qr.Scan(input, 0)
@@ -21,3 +25,15 @@ func TestFatQRAPI(t *testing.T) {
 		t.Errorf("Should not have occurred an error for: %s, %+v", input, err)
 	}
 }
+
+func BenchmarkFatQRScan(b *testing.B) {
+	b.ReportAllocs()
+
+	for b.Loop() {
+		var qr gofatqr.FatQR
+		err := qr.Scan(completeInput, 0)
+		if err != nil {
+			b.Fatalf("unexpected error: %v", err)
+		}
+	}
+}

fatQR.go

@@ -627,7 +627,7 @@ func (fq *FatQR) scanPart(part []string) error {
 
 func (fq *FatQR) scanParts(parts []string) error {
 	for k := range parts {
-		keyValuePair := strings.Split(parts[k], ":")
+		keyValuePair := strings.SplitN(parts[k], ":", 2)
 		if len(keyValuePair) != 2 {
 			return fmt.Errorf("failed to parse key value pair: %s", parts[k])
 		}