diff --git a/tests/go/prog/addprimesum/main.go b/tests/go/prog/addprimesum/main.go
index 781bb32a..e722cd38 100644
--- a/tests/go/prog/addprimesum/main.go
+++ b/tests/go/prog/addprimesum/main.go
@@ -4,8 +4,6 @@ import (
 	"fmt"
 	"os"
 	"strconv"
-
-	"github.com/01-edu/z01"
 )
 
 func isPrime(nb int) bool {
@@ -31,14 +29,12 @@ func isPrime(nb int) bool {
 
 func main() {
 	if len(os.Args) != 2 {
-		z01.PrintRune('0')
-		z01.PrintRune('\n')
+		fmt.Println("0")
 	} else {
 		argument, _ := strconv.Atoi(os.Args[1])
 
 		if argument < 0 {
-			z01.PrintRune('0')
-			z01.PrintRune('\n')
+			fmt.Println("0")
 		} else {
 			result := 0
 			for ; argument >= 0; argument-- {
diff --git a/tests/go/prog/boolean/main.go b/tests/go/prog/boolean/main.go
index 611016a1..86314ad9 100644
--- a/tests/go/prog/boolean/main.go
+++ b/tests/go/prog/boolean/main.go
@@ -1,33 +1,14 @@
 package main
 
 import (
+	"fmt"
 	"os"
-
-	"github.com/01-edu/z01"
 )
 
-func printStr(str string) {
-	arrayStr := []rune(str)
-
-	for i := 0; i < len(arrayStr); i++ {
-		z01.PrintRune(arrayStr[i])
-	}
-	z01.PrintRune('\n')
-}
-
-func isEven(nbr int) bool {
-	return nbr%2 == 0
-}
-
 func main() {
-	EvenMsg := "I have an even number of arguments"
-	OddMsg := "I have an odd number of arguments"
-
-	lenOfArg := len(os.Args) - 1
-
-	if isEven(lenOfArg) {
-		printStr(EvenMsg)
+	if len(os.Args)-1%2 == 0 {
+		fmt.Println("I have an even number of arguments")
 	} else {
-		printStr(OddMsg)
+		fmt.Println("I have an odd number of arguments")
 	}
 }
diff --git a/tests/go/prog/brainfuck/main.go b/tests/go/prog/brainfuck/main.go
index e8e3bf0c..d1afa176 100644
--- a/tests/go/prog/brainfuck/main.go
+++ b/tests/go/prog/brainfuck/main.go
@@ -1,9 +1,8 @@
 package main
 
 import (
+	"fmt"
 	"os"
-
-	"github.com/01-edu/z01"
 )
 
 const SIZE = 2048
@@ -34,7 +33,7 @@ func main() {
 			arby[pos]--
 		case '.':
 			// print the pointed byte on std output
-			z01.PrintRune(rune(arby[pos]))
+			fmt.Printf("%c", rune(arby[pos]))
 		case '[':
 			// go to the matching ']' if the pointed byte is 0 (while start)
 			openBr = 0
diff --git a/tests/go/prog/displayalpham/main.go b/tests/go/prog/displayalpham/main.go
index 44ffb600..67f54a2b 100644
--- a/tests/go/prog/displayalpham/main.go
+++ b/tests/go/prog/displayalpham/main.go
@@ -1,15 +1,15 @@
 package main
 
-import "github.com/01-edu/z01"
+import "fmt"
 
 func main() {
 	diff := 'a' - 'A'
 	for c := 'a'; c <= 'z'; c++ {
 		if c%2 == 0 {
-			z01.PrintRune(c - diff)
+			fmt.Printf("%c", c-diff)
 		} else {
-			z01.PrintRune(c)
+			fmt.Printf("%c", c)
 		}
 	}
-	z01.PrintRune('\n')
+	fmt.Println()
 }
diff --git a/tests/go/prog/displayalrevm/main.go b/tests/go/prog/displayalrevm/main.go
index f0ff0eb3..87f45afb 100644
--- a/tests/go/prog/displayalrevm/main.go
+++ b/tests/go/prog/displayalrevm/main.go
@@ -1,15 +1,15 @@
 package main
 
-import "github.com/01-edu/z01"
+import "fmt"
 
 func main() {
 	diff := 'a' - 'A'
 	for c := 'z'; c >= 'a'; c-- {
 		if c%2 == 0 {
-			z01.PrintRune(c)
+			fmt.Printf("%c", c)
 		} else {
-			z01.PrintRune(c - diff)
+			fmt.Printf("%c", c-diff)
 		}
 	}
-	z01.PrintRune('\n')
+	fmt.Println()
 }
diff --git a/tests/go/prog/firstword/main.go b/tests/go/prog/firstword/main.go
index b4e83155..cbdbb6b7 100644
--- a/tests/go/prog/firstword/main.go
+++ b/tests/go/prog/firstword/main.go
@@ -3,26 +3,22 @@ package main
 import (
 	"fmt"
 	"os"
-
-	"github.com/01-edu/z01"
 )
 
 func main() {
 	if len(os.Args) == 2 {
 		for i := 0; i < len(os.Args[1]); i++ {
 			if os.Args[1][i] != ' ' {
-				z01.PrintRune(rune(os.Args[1][i]))
+				fmt.Printf("%c", rune(os.Args[1][i]))
 
 				if i != len(os.Args[1])-1 {
 					if os.Args[1][i+1] == ' ' {
-						z01.PrintRune('\n')
+						fmt.Println()
 						return
 					}
 				}
 			}
 		}
-		z01.PrintRune('\n')
-	} else {
 		fmt.Println()
 	}
 }
diff --git a/tests/go/prog/fprime/main.go b/tests/go/prog/fprime/main.go
index 6e744739..9f28f583 100644
--- a/tests/go/prog/fprime/main.go
+++ b/tests/go/prog/fprime/main.go
@@ -4,8 +4,6 @@ import (
 	"fmt"
 	"os"
 	"strconv"
-
-	"github.com/01-edu/z01"
 )
 
 func fprime(value int) {
@@ -19,13 +17,13 @@ func fprime(value int) {
 			value = value / divisionIterator
 
 			if value > 1 {
-				z01.PrintRune('*')
+				fmt.Print("*")
 			}
 			divisionIterator--
 		}
 		divisionIterator++
 	}
-	z01.PrintRune('\n')
+	fmt.Println()
 }
 
 func main() {
diff --git a/tests/go/prog/hiddenp/main.go b/tests/go/prog/hiddenp/main.go
index e1909c6c..0888e02d 100644
--- a/tests/go/prog/hiddenp/main.go
+++ b/tests/go/prog/hiddenp/main.go
@@ -1,9 +1,8 @@
 package main
 
 import (
+	"fmt"
 	"os"
-
-	"github.com/01-edu/z01"
 )
 
 func main() {
@@ -15,13 +14,11 @@ func main() {
 	second := os.Args[2]
 
 	if first == "" {
-		z01.PrintRune('1')
-		z01.PrintRune('\n')
+		fmt.Println("1")
 		return
 	}
 	if second == "" {
-		z01.PrintRune('0')
-		z01.PrintRune('\n')
+		fmt.Println("0")
 		return
 	}
 
@@ -47,9 +44,8 @@ func main() {
 	}
 
 	if count == len(first) {
-		z01.PrintRune('1')
+		fmt.Println("1")
 	} else {
-		z01.PrintRune('0')
+		fmt.Println("0")
 	}
-	z01.PrintRune('\n')
 }
diff --git a/tests/go/prog/nbrconvertalpha/main.go b/tests/go/prog/nbrconvertalpha/main.go
index 614b6de7..85fc73b7 100644
--- a/tests/go/prog/nbrconvertalpha/main.go
+++ b/tests/go/prog/nbrconvertalpha/main.go
@@ -1,15 +1,15 @@
 package main
 
 import (
+	"fmt"
 	"os"
 	"strconv"
-
-	"github.com/01-edu/z01"
+	"unicode"
 )
 
-func IsNumeric(str string) bool {
-	for i := 0; i < len(str); i++ {
-		if !(str[i] >= '0' && str[i] <= '9') {
+func IsNumeric(s string) bool {
+	for _, r := range s {
+		if !unicode.IsDigit(r) {
 			return false
 		}
 	}
@@ -28,18 +28,18 @@ func main() {
 
 			if number <= 26 && number >= 1 && !boole {
 				number += 96
-				z01.PrintRune(rune(number))
+				fmt.Printf("%c", rune(number))
 			} else if number <= 26 && number >= 1 && boole {
 				number += 64
-				z01.PrintRune(rune(number))
+				fmt.Printf("%c", rune(number))
 			} else {
-				z01.PrintRune(' ')
+				fmt.Print(" ")
 			}
 		} else {
 			if !(arguments[i] == "--upper" && i == 0) {
-				z01.PrintRune(' ')
+				fmt.Print(" ")
 			}
 		}
 	}
-	z01.PrintRune('\n')
+	fmt.Println()
 }
diff --git a/tests/go/prog/onlya/main.go b/tests/go/prog/onlya/main.go
index 9f0fad4c..712c4759 100644
--- a/tests/go/prog/onlya/main.go
+++ b/tests/go/prog/onlya/main.go
@@ -1,7 +1,7 @@
 package main
 
-import "github.com/01-edu/z01"
+import "fmt"
 
 func main() {
-	z01.PrintRune('a')
+	fmt.Print("a")
 }
diff --git a/tests/go/prog/onlyz/main.go b/tests/go/prog/onlyz/main.go
index 60703188..e80f2923 100644
--- a/tests/go/prog/onlyz/main.go
+++ b/tests/go/prog/onlyz/main.go
@@ -1,7 +1,7 @@
 package main
 
-import "github.com/01-edu/z01"
+import "fmt"
 
 func main() {
-	z01.PrintRune('z')
+	fmt.Print("z")
 }
diff --git a/tests/go/prog/piglatin/main.go b/tests/go/prog/piglatin/main.go
index 8d44b494..3dba5587 100644
--- a/tests/go/prog/piglatin/main.go
+++ b/tests/go/prog/piglatin/main.go
@@ -3,13 +3,23 @@ package main
 import (
 	"fmt"
 	"os"
-
-	"github.com/01-edu/z01"
 )
 
+func firstNotVowel(letters []rune) int {
+	index := 0
+	for i := 0; i < len(letters); i++ {
+		if letters[i] == 'a' || letters[i] == 'e' || letters[i] == 'i' || letters[i] == 'o' || letters[i] == 'u' ||
+			letters[i] == 'A' || letters[i] == 'E' || letters[i] == 'I' || letters[i] == 'O' || letters[i] == 'U' {
+			return index
+		}
+		index++
+	}
+	return 0
+}
+
 func main() {
 	if len(os.Args) != 2 || os.Args[1] == "" {
-		z01.PrintRune('\n')
+		fmt.Println()
 		return
 	}
 	letters := []rune(os.Args[1])
@@ -25,15 +35,3 @@ func main() {
 		}
 	}
 }
-
-func firstNotVowel(letters []rune) int {
-	index := 0
-	for i := 0; i < len(letters); i++ {
-		if letters[i] == 'a' || letters[i] == 'e' || letters[i] == 'i' || letters[i] == 'o' || letters[i] == 'u' ||
-			letters[i] == 'A' || letters[i] == 'E' || letters[i] == 'I' || letters[i] == 'O' || letters[i] == 'U' {
-			return index
-		}
-		index++
-	}
-	return 0
-}
diff --git a/tests/go/prog/printchessboard/main.go b/tests/go/prog/printchessboard/main.go
index 0a683c33..349b3e4b 100644
--- a/tests/go/prog/printchessboard/main.go
+++ b/tests/go/prog/printchessboard/main.go
@@ -1,19 +1,11 @@
 package main
 
 import (
+	"fmt"
 	"os"
 	"strconv"
-
-	"github.com/01-edu/z01"
 )
 
-func printLine(str string) {
-	for _, c := range str {
-		z01.PrintRune(c)
-	}
-	z01.PrintRune('\n')
-}
-
 func solve(x, y int) {
 	for i := 0; i < x; i++ {
 		line := ""
@@ -28,20 +20,20 @@ func solve(x, y int) {
 				line += " "
 			}
 		}
-		printLine(line)
+		fmt.Println(line)
 	}
 }
 
 func main() {
 	args := os.Args[1:]
 	if len(args) != 2 {
-		printLine("Error")
+		fmt.Println("Error")
 		return
 	}
 	x, _ := strconv.Atoi(args[1])
 	y, _ := strconv.Atoi(args[0])
 	if x <= 0 || y <= 0 {
-		printLine("Error")
+		fmt.Println("Error")
 		return
 	}
 	solve(x, y)
diff --git a/tests/go/prog/printdigits/main.go b/tests/go/prog/printdigits/main.go
index e2df9aa1..d67da467 100644
--- a/tests/go/prog/printdigits/main.go
+++ b/tests/go/prog/printdigits/main.go
@@ -1,10 +1,10 @@
 package main
 
-import "github.com/01-edu/z01"
+import "fmt"
 
 func main() {
 	for i := '0'; i <= '9'; i++ {
-		z01.PrintRune(i)
+		fmt.Printf("%c", i)
 	}
-	z01.PrintRune('\n')
+	fmt.Println()
 }
diff --git a/tests/go/prog/printhex/main.go b/tests/go/prog/printhex/main.go
index b5149230..5218b8fd 100644
--- a/tests/go/prog/printhex/main.go
+++ b/tests/go/prog/printhex/main.go
@@ -4,8 +4,6 @@ import (
 	"fmt"
 	"os"
 	"strconv"
-
-	"github.com/01-edu/z01"
 )
 
 func printBase(nbr int, base string) {
@@ -19,18 +17,18 @@ func printBase(nbr int, base string) {
 		nbr = nbr / baseSize
 	}
 	for j := len(result) - 1; j >= 0; j-- {
-		z01.PrintRune(result[j])
+		fmt.Printf("%c", result[j])
 	}
 }
 
 func main() {
 	if len(os.Args) != 2 {
-		z01.PrintRune('\n')
+		fmt.Println()
 	} else {
 		nbr, _ := strconv.Atoi(os.Args[1])
 		if nbr != 0 {
 			printBase(nbr, "0123456789abcdef")
-			z01.PrintRune('\n')
+			fmt.Println()
 		} else {
 			fmt.Println(0)
 		}
diff --git a/tests/go/prog/raid2/main.go b/tests/go/prog/raid2/main.go
index 362b50b3..8e4c22ee 100644
--- a/tests/go/prog/raid2/main.go
+++ b/tests/go/prog/raid2/main.go
@@ -3,20 +3,18 @@ package main
 import (
 	"fmt"
 	"os"
-
-	"github.com/01-edu/z01"
 )
 
 // Prints in standard output the sudoku board
 func printBoard(board [][]rune) {
 	for _, row := range board {
 		for i, e := range row {
-			z01.PrintRune(e)
+			fmt.Printf("%c", e)
 			if i != len(row)-1 {
-				z01.PrintRune(' ')
+				fmt.Print(" ")
 			}
 		}
-		z01.PrintRune('\n')
+		fmt.Println()
 	}
 }
 
diff --git a/tests/go/prog/repeatalpha/main.go b/tests/go/prog/repeatalpha/main.go
index 42b14a28..d2ec0712 100644
--- a/tests/go/prog/repeatalpha/main.go
+++ b/tests/go/prog/repeatalpha/main.go
@@ -1,23 +1,22 @@
 package main
 
 import (
+	"fmt"
 	"os"
 	"unicode"
-
-	"github.com/01-edu/z01"
 )
 
 func main() {
 	if len(os.Args) == 2 {
 		for _, r := range os.Args[1] {
-			z01.PrintRune(r)
+			fmt.Printf("%c", r)
 			if unicode.IsLetter(r) {
 				rep := unicode.ToLower(r) - 'a'
 				for i := 0; i < int(rep); i++ {
-					z01.PrintRune(r)
+					fmt.Printf("%c", r)
 				}
 			}
 		}
-		z01.PrintRune('\n')
+		fmt.Println()
 	}
 }
diff --git a/tests/go/prog/rot13/main.go b/tests/go/prog/rot13/main.go
index 8609493f..fdcfb4bd 100644
--- a/tests/go/prog/rot13/main.go
+++ b/tests/go/prog/rot13/main.go
@@ -1,9 +1,8 @@
 package main
 
 import (
+	"fmt"
 	"os"
-
-	"github.com/01-edu/z01"
 )
 
 func main() {
@@ -22,8 +21,8 @@ func main() {
 					r += 13
 				}
 			}
-			z01.PrintRune(r)
+			fmt.Printf("%c", r)
 		}
-		z01.PrintRune('\n')
+		fmt.Println()
 	}
 }
diff --git a/tests/go/prog/uniqueoccurences/main.go b/tests/go/prog/uniqueoccurences/main.go
index 354815ac..1b24a108 100644
--- a/tests/go/prog/uniqueoccurences/main.go
+++ b/tests/go/prog/uniqueoccurences/main.go
@@ -1,9 +1,8 @@
 package main
 
 import (
+	"fmt"
 	"os"
-
-	"github.com/01-edu/z01"
 )
 
 func solve(str string) bool {
@@ -23,14 +22,14 @@ func solve(str string) bool {
 
 func print(str string) {
 	for _, v := range str {
-		z01.PrintRune(v)
+		fmt.Printf("%c", v)
 	}
 }
 
 func main() {
 	args := os.Args[1:]
 	if len(args) != 1 {
-		z01.PrintRune('\n')
+		fmt.Println()
 		return
 	}
 	result := solve(args[0])
diff --git a/tests/go/prog/ztail/main.go b/tests/go/prog/ztail/main.go
index 58163174..e10a213a 100644
--- a/tests/go/prog/ztail/main.go
+++ b/tests/go/prog/ztail/main.go
@@ -4,8 +4,6 @@ import (
 	"fmt"
 	"os"
 	"strconv"
-
-	"github.com/01-edu/z01"
 )
 
 func numberOfBytes(args []string) (int, []string) {
@@ -77,11 +75,11 @@ func main() {
 		}
 
 		for _, c := range read {
-			z01.PrintRune(rune(c))
+			fmt.Printf("%c", rune(c))
 		}
 
 		if j < len(files)-1 {
-			z01.PrintRune('\n')
+			fmt.Println()
 		}
 
 		fi.Close()