diff --git a/Makefile b/Makefile
deleted file mode 100644
index aad01a3..0000000
--- a/Makefile
+++ /dev/null
@@ -1,101 +0,0 @@
-# The binaries to build (just the basenames).
-BINS := apg
-
-VERSION ?= $(shell grep VersionString apg.go | head -1 | awk '{print $$5}' | sed 's/"//g')
-ALL_PLATFORMS := darwin/amd64 darwin/arm64                      \
-    linux/amd64 linux/arm linux/arm64 linux/ppc64le linux/s390x \
-    freebsd/386 freebsd/amd64 freebsd/arm                       \
-    openbsd/386 openbsd/amd64 openbsd/arm                       \
-    netbsd/386 netbsd/amd64 netbsd/arm                          \
-    windows/386 windows/amd64
-OS := $(if $(GOOS),$(GOOS),$(shell go env GOOS))
-ARCH := $(if $(GOARCH),$(GOARCH),$(shell go env GOARCH))
-TAG := $(VERSION)__$(OS)_$(ARCH)
-
-BIN_EXTENSION :=
-ifeq ($(OS), windows)
-  BIN_EXTENSION := .exe
-endif
-
-# If you want to build all binaries, see the 'all-build' rule.
-all: # @HELP builds binaries for one platform ($OS/$ARCH)
-all: build
-
-# For the following OS/ARCH expansions, we transform OS/ARCH into OS_ARCH
-# because make pattern rules don't match with embedded '/' characters.
-
-build-%:
-	@$(MAKE) build                        \
-	    --no-print-directory              \
-	    GOOS=$(firstword $(subst _, ,$*)) \
-	    GOARCH=$(lastword $(subst _, ,$*))
-
-all-build: # @HELP builds binaries for all platforms
-all-build: $(addprefix build-, $(subst /,_, $(ALL_PLATFORMS)))
-OUTBINS = $(foreach bin,$(BINS),bin/v$(VERSION)/$(OS)_$(ARCH)/$(bin)$(BIN_EXTENSION))
-build: $(OUTBINS)
-BUILD_DIRS := bin/v$(VERSION)/$(OS)_$(ARCH)     \
-              bin/zip-files/v$(VERSION)         \
-              .go/bin/v$(VERSION)/$(OS)_$(ARCH) \
-              .go/cache
-
-# Each outbin target is just a facade for the respective stampfile target.
-# This `eval` establishes the dependencies for each.
-$(foreach outbin,$(OUTBINS),$(eval  \
-    $(outbin): .go/$(outbin).stamp  \
-))
-# This is the target definition for all outbins.
-$(OUTBINS):
-	@true
-
-# Each stampfile target can reference an $(OUTBIN) variable.
-$(foreach outbin,$(OUTBINS),$(eval $(strip   \
-    .go/$(outbin).stamp: OUTBIN = $(outbin)  \
-)))
-# This is the target definition for all stampfiles.
-# This will build the binary under ./.go and update the real binary iff needed.
-STAMPS = $(foreach outbin,$(OUTBINS),.go/$(outbin).stamp)
-.PHONY: $(STAMPS)
-$(STAMPS): go-build
-	@echo "binary: $(OUTBIN)"
-	@if ! cmp -s .go/$(OUTBIN) $(OUTBIN); then  \
-	    mv .go/$(OUTBIN) $(OUTBIN);             \
-	    zip -9 ./bin/zip-files/v$(VERSION)/apg_v$(VERSION)_$(OS)_$(ARCH).zip $(OUTBIN) \
-	    date >$@;                               \
-	fi
-
-# This runs the actual `go build` which updates all binaries.
-go-build: $(BUILD_DIRS)
-	@echo
-	@echo "building for $(OS)/$(ARCH)"
-	@go build -o .go/bin/v$(VERSION)/$(OS)_$(ARCH)/apg$(BIN_EXTENSION) apg.go
-
-version: # @HELP outputs the version string
-version:
-	@echo $(VERSION)
-
-	    "
-
-$(BUILD_DIRS):
-	@mkdir -p $@
-
-clean: # @HELP removes built binaries and temporary files
-clean: bin-clean
-
-bin-clean:
-	rm -rf .go bin *.exe
-
-help: # @HELP prints this message
-help:
-	@echo "VARIABLES:"
-	@echo "  BINS = $(BINS)"
-	@echo "  OS = $(OS)"
-	@echo "  ARCH = $(ARCH)"
-	@echo "  REGISTRY = $(REGISTRY)"
-	@echo
-	@echo "TARGETS:"
-	@grep -E '^.*: *# *@HELP' $(MAKEFILE_LIST)    \
-	    | awk '                                   \
-	        BEGIN {FS = ": *# *@HELP"};           \
-	        { printf "  %-30s %s\n", $$1, $$2 };  \
-	    '
diff --git a/apg.go b/apg.go
index db1147d..3398de8 100644
--- a/apg.go
+++ b/apg.go
@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"fmt"
+	"log"
 	"os"
 )
 
@@ -63,9 +64,11 @@ func init() {
 	flag.Parse()
 	if config.showVersion {
 		_, _ = os.Stderr.WriteString("Winni's Advanced Password Generator Clone (apg.go) v" + VersionString + "\n")
-		_, _ = os.Stderr.WriteString("© 2021 by Winni Neessen\n")
+		_, _ = os.Stderr.WriteString("(C) 2021 by Winni Neessen\n")
 		os.Exit(0)
 	}
+
+	log.SetFlags(log.Ltime | log.Ldate | log.Lshortfile)
 }
 
 // Main function that generated the passwords and returns them
@@ -77,8 +80,7 @@ func main() {
 	for i := 1; i <= config.numOfPass; i++ {
 		pwString, err := getRandChar(&charRange, pwLength)
 		if err != nil {
-			fmt.Printf("getRandChar returned an error: %q\n", err.Error())
-			os.Exit(1)
+			log.Fatalf("getRandChar returned an error: %q\n", err)
 		}
 
 		switch config.outputMode {
@@ -86,8 +88,7 @@ func main() {
 			{
 				spelledPw, err := spellPasswordString(pwString)
 				if err != nil {
-					fmt.Printf("spellPasswordString returned an error: %q\n", err.Error())
-					os.Exit(1)
+					log.Fatalf("spellPasswordString returned an error: %q\n", err.Error())
 				}
 				fmt.Printf("%v (%v)\n", pwString, spelledPw)
 				break
diff --git a/apg_test.go b/apg_test.go
index e02a3f9..e411f12 100644
--- a/apg_test.go
+++ b/apg_test.go
@@ -16,31 +16,31 @@ func TestGetRandNum(t *testing.T) {
 	t.Run("maxNum_is_1000", func(t *testing.T) {
 		randNum, err := getRandNum(1000)
 		if err != nil {
-			t.Errorf("Random number generation failed: %v", err.Error())
+			t.Fatalf("Random number generation failed: %v", err.Error())
 		}
 		if randNum > 1000 {
-			t.Errorf("Generated random number between 0 and 1000 is too big: %v", randNum)
+			t.Fatalf("Generated random number between 0 and 1000 is too big: %v", randNum)
 		}
 		if randNum < 0 {
-			t.Errorf("Generated random number between 0 and 1000 is too small: %v", randNum)
+			t.Fatalf("Generated random number between 0 and 1000 is too small: %v", randNum)
 		}
 	})
 	t.Run("maxNum_is_1", func(t *testing.T) {
 		randNum, err := getRandNum(1)
 		if err != nil {
-			t.Errorf("Random number generation failed: %v", err.Error())
+			t.Fatalf("Random number generation failed: %v", err.Error())
 		}
 		if randNum > 1 {
-			t.Errorf("Generated random number between 0 and 1000 is too big: %v", randNum)
+			t.Fatalf("Generated random number between 0 and 1000 is too big: %v", randNum)
 		}
 		if randNum < 0 {
-			t.Errorf("Generated random number between 0 and 1000 is too small: %v", randNum)
+			t.Fatalf("Generated random number between 0 and 1000 is too small: %v", randNum)
 		}
 	})
 	t.Run("maxNum_is_0", func(t *testing.T) {
 		randNum, err := getRandNum(0)
 		if err == nil {
-			t.Errorf("Random number expected to fail, but provided a value instead: %v", randNum)
+			t.Fatalf("Random number expected to fail, but provided a value instead: %v", randNum)
 		}
 	})
 }
@@ -51,10 +51,10 @@ func TestGetRandChar(t *testing.T) {
 		charRange := "ABC"
 		randChar, err := getRandChar(&charRange, 1)
 		if err != nil {
-			t.Errorf("Random character generation failed => %v", err.Error())
+			t.Fatalf("Random character generation failed => %v", err.Error())
 		}
 		if randChar != "A" && randChar != "B" && randChar != "C" {
-			t.Errorf("Random character generation failed. Expected A, B or C but got: %v", randChar)
+			t.Fatalf("Random character generation failed. Expected A, B or C but got: %v", randChar)
 		}
 	})
 
@@ -62,10 +62,10 @@ func TestGetRandChar(t *testing.T) {
 		charRange := "ABC"
 		randChar, err := getRandChar(&charRange, 1000)
 		if err != nil {
-			t.Errorf("Random character generation failed => %v", err.Error())
+			t.Fatalf("Random character generation failed => %v", err.Error())
 		}
 		if len(randChar) != 1000 {
-			t.Errorf("Generated random characters with 1000 chars returned wrong amount of chars: %v",
+			t.Fatalf("Generated random characters with 1000 chars returned wrong amount of chars: %v",
 				len(randChar))
 		}
 	})
@@ -74,7 +74,7 @@ func TestGetRandChar(t *testing.T) {
 		charRange := "ABC"
 		randChar, err := getRandChar(&charRange, -2000)
 		if err == nil {
-			t.Errorf("Generated random characters expected to fail, but returned a value => %v",
+			t.Fatalf("Generated random characters expected to fail, but returned a value => %v",
 				randChar)
 		}
 	})
@@ -96,7 +96,7 @@ func TestGetCharRange(t *testing.T) {
 		for _, curChar := range charRange {
 			searchAllowedBytes := containsByte(allowedBytes, int(curChar))
 			if !searchAllowedBytes {
-				t.Errorf("Character range for lower-case only returned invalid value: %v",
+				t.Fatalf("Character range for lower-case only returned invalid value: %v",
 					string(curChar))
 			}
 		}
@@ -115,7 +115,7 @@ func TestGetCharRange(t *testing.T) {
 		for _, curChar := range charRange {
 			searchAllowedBytes := containsByte(allowedBytes, int(curChar))
 			if !searchAllowedBytes {
-				t.Errorf("Character range for lower-case only (human readable) returned invalid value: %v",
+				t.Fatalf("Character range for lower-case only (human readable) returned invalid value: %v",
 					string(curChar))
 			}
 		}
@@ -134,7 +134,7 @@ func TestGetCharRange(t *testing.T) {
 		for _, curChar := range charRange {
 			searchAllowedBytes := containsByte(allowedBytes, int(curChar))
 			if !searchAllowedBytes {
-				t.Errorf("Character range for upper-case only returned invalid value: %v",
+				t.Fatalf("Character range for upper-case only returned invalid value: %v",
 					string(curChar))
 			}
 		}
@@ -153,7 +153,7 @@ func TestGetCharRange(t *testing.T) {
 		for _, curChar := range charRange {
 			searchAllowedBytes := containsByte(allowedBytes, int(curChar))
 			if !searchAllowedBytes {
-				t.Errorf("Character range for upper-case only (human readable) returned invalid value: %v",
+				t.Fatalf("Character range for upper-case only (human readable) returned invalid value: %v",
 					string(curChar))
 			}
 		}
@@ -171,7 +171,7 @@ func TestGetCharRange(t *testing.T) {
 		for _, curChar := range charRange {
 			searchAllowedBytes := containsByte(allowedBytes, int(curChar))
 			if !searchAllowedBytes {
-				t.Errorf("Character range for numbers only returned invalid value: %v",
+				t.Fatalf("Character range for numbers only returned invalid value: %v",
 					string(curChar))
 			}
 		}
@@ -189,7 +189,7 @@ func TestGetCharRange(t *testing.T) {
 		for _, curChar := range charRange {
 			searchAllowedBytes := containsByte(allowedBytes, int(curChar))
 			if !searchAllowedBytes {
-				t.Errorf("Character range for numbers (human readable) only returned invalid value: %v",
+				t.Fatalf("Character range for numbers (human readable) only returned invalid value: %v",
 					string(curChar))
 			}
 		}
@@ -208,7 +208,7 @@ func TestGetCharRange(t *testing.T) {
 		for _, curChar := range charRange {
 			searchAllowedBytes := containsByte(allowedBytes, int(curChar))
 			if !searchAllowedBytes {
-				t.Errorf("Character range for special characters only returned invalid value: %v",
+				t.Fatalf("Character range for special characters only returned invalid value: %v",
 					string(curChar))
 			}
 		}
@@ -226,7 +226,7 @@ func TestGetCharRange(t *testing.T) {
 		for _, curChar := range charRange {
 			searchAllowedBytes := containsByte(allowedBytes, int(curChar))
 			if !searchAllowedBytes {
-				t.Errorf("Character range for special characters only returned invalid value: %v",
+				t.Fatalf("Character range for special characters only returned invalid value: %v",
 					string(curChar))
 			}
 		}
@@ -238,37 +238,37 @@ func TestConvert(t *testing.T) {
 	t.Run("convert_A_to_Alfa", func(t *testing.T) {
 		charToString, err := convertCharToName('A')
 		if err != nil {
-			t.Errorf("Character to string conversion failed: %v", err.Error())
+			t.Fatalf("Character to string conversion failed: %v", err.Error())
 		}
 		if charToString != "Alfa" {
-			t.Errorf("Converting 'A' to string did not return the correct value of 'Alfa': %q", charToString)
+			t.Fatalf("Converting 'A' to string did not return the correct value of 'Alfa': %q", charToString)
 		}
 	})
 	t.Run("convert_a_to_alfa", func(t *testing.T) {
 		charToString, err := convertCharToName('a')
 		if err != nil {
-			t.Errorf("Character to string conversion failed: %v", err.Error())
+			t.Fatalf("Character to string conversion failed: %v", err.Error())
 		}
 		if charToString != "alfa" {
-			t.Errorf("Converting 'a' to string did not return the correct value of 'alfa': %q", charToString)
+			t.Fatalf("Converting 'a' to string did not return the correct value of 'alfa': %q", charToString)
 		}
 	})
 	t.Run("convert_0_to_ZERO", func(t *testing.T) {
 		charToString, err := convertCharToName('0')
 		if err != nil {
-			t.Errorf("Character to string conversion failed: %v", err.Error())
+			t.Fatalf("Character to string conversion failed: %v", err.Error())
 		}
 		if charToString != "ZERO" {
-			t.Errorf("Converting '0' to string did not return the correct value of 'ZERO': %q", charToString)
+			t.Fatalf("Converting '0' to string did not return the correct value of 'ZERO': %q", charToString)
 		}
 	})
 	t.Run("convert_/_to_SLASH", func(t *testing.T) {
 		charToString, err := convertCharToName('/')
 		if err != nil {
-			t.Errorf("Character to string conversion failed: %v", err.Error())
+			t.Fatalf("Character to string conversion failed: %v", err.Error())
 		}
 		if charToString != "SLASH" {
-			t.Errorf("Converting '/' to string did not return the correct value of 'SLASH': %q", charToString)
+			t.Fatalf("Converting '/' to string did not return the correct value of 'SLASH': %q", charToString)
 		}
 	})
 	t.Run("all_chars_convert_to_string", func(t *testing.T) {
@@ -281,7 +281,7 @@ func TestConvert(t *testing.T) {
 		for _, curChar := range charRange {
 			_, err := convertCharToName(byte(curChar))
 			if err != nil {
-				t.Errorf("Character to string conversion failed: %v", err.Error())
+				t.Fatalf("Character to string conversion failed: %v", err.Error())
 			}
 		}
 	})
@@ -289,10 +289,10 @@ func TestConvert(t *testing.T) {
 		pwString := "Ab!"
 		spelledString, err := spellPasswordString(pwString)
 		if err != nil {
-			t.Errorf("password spelling failed: %v", err.Error())
+			t.Fatalf("password spelling failed: %v", err.Error())
 		}
 		if spelledString != "Alfa/bravo/EXCLAMATION_POINT" {
-			t.Errorf(
+			t.Fatalf(
 				"Spelling pwString 'Ab!' is expected to provide 'Alfa/bravo/EXCLAMATION_POINT', but returned: %q",
 				spelledString)
 		}
@@ -305,14 +305,14 @@ func TestForceFailures(t *testing.T) {
 		maxNum := 9223372036854775807
 		maxNumBigInt := big.NewInt(int64(maxNum) + 1)
 		if maxNumBigInt.IsUint64() {
-			t.Errorf("Calling big.NewInt() with too large number expected to fail: %v", maxNumBigInt)
+			t.Fatalf("Calling big.NewInt() with too large number expected to fail: %v", maxNumBigInt)
 		}
 	})
 
 	t.Run("negative value for big.NewInt()", func(t *testing.T) {
 		randNum, err := getRandNum(-20000)
 		if err == nil {
-			t.Errorf("Calling getRandNum() with negative value is expected to fail, but returned value: %v",
+			t.Fatalf("Calling getRandNum() with negative value is expected to fail, but returned value: %v",
 				randNum)
 		}
 	})
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..dd33c59
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/wneessen/apg.go
+
+go 1.16
diff --git a/params.go b/params.go
index 48b2ae0..5adc5b3 100644
--- a/params.go
+++ b/params.go
@@ -1,8 +1,7 @@
 package main
 
 import (
-	"fmt"
-	"os"
+	"log"
 )
 
 // Parse the parameters and set the according config flags
@@ -22,8 +21,7 @@ func parseParams() {
 		config.useLowerCase == false &&
 		config.useNumber == false &&
 		config.useSpecial == false {
-		fmt.Printf("No password mode set. Cannot generate password from empty character set.")
-		os.Exit(1)
+		log.Fatalf("No password mode set. Cannot generate password from empty character set.")
 	}
 
 	// Set output mode
@@ -90,8 +88,7 @@ func parseNewStyleParams() {
 			config.useComplex = false
 			break
 		default:
-			fmt.Printf("Unknown password style parameter: %q\n", string(curParam))
-			os.Exit(1)
+			log.Fatalf("Unknown password style parameter: %q\n", string(curParam))
 		}
 	}
 }