Simplify

subjects/isnegative/README.md

@@ -31,10 +31,9 @@ func main() {
 And its output :
 
 ```console
-student@ubuntu:~/isnegative/test$ go build
-student@ubuntu:~/isnegative/test$ ./test
+$ go run .
 F
 F
 T
-student@ubuntu:~/isnegative/test$
+$
 ```

subjects/printalphabet/README.md

@@ -9,8 +9,7 @@ A line is a sequence of characters preceding the [end of line](https://en.wikipe
 ### Usage
 
 ```console
-student@ubuntu:~/printalphabet$ go build
-student@ubuntu:~/printalphabet$ ./printalphabet
+$ go run .
 abcdefghijklmnopqrstuvwxyz
-student@ubuntu:~/printalphabet$
+$
 ```

subjects/printcomb/README.md

@@ -31,10 +31,9 @@ func main() {
 This is the incomplete output :
 
 ```console
-student@ubuntu:~/printcomb/test$ go build
-student@ubuntu:~/printcomb/test$ ./test | cat -e
+$ go run . | cat -e
 012, 013, 014, 015, 016, 017, 018, 019, 023, ..., 689, 789$
-student@ubuntu:~/printcomb/test$
+$
 ```
 
 `000` or `999` are not valid combinations because the digits are not different.

subjects/printcomb2/README.md

@@ -31,8 +31,7 @@ func main() {
 This is the incomplete output :
 
 ```console
-student@ubuntu:~/printcomb2/test$ go build
-student@ubuntu:~/printcomb2/test$ ./test | cat -e
+$ go run . | cat -e
 00 01, 00 02, 00 03, ..., 00 98, 00 99, 01 02, 01 03, ..., 97 98, 97 99, 98 99$
-student@ubuntu:~/printcomb2/test$
+$
 ```

subjects/printcombn/README.md

@@ -39,10 +39,9 @@ func main() {
 And its output :
 
 ```console
-student@ubuntu:~/printcombn/test$ go build
-student@ubuntu:~/printcombn/test$ ./test
+$ go run .
 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
 012, 013, 014, 015, 016, 017, 018, ... 679, 689, 789
 012345678, 012345679, ..., 123456789
-student@ubuntu:~/printcombn/test$
+$
 ```

subjects/printdigits/README.md

@@ -9,8 +9,7 @@ A line is a sequence of characters preceding the end of line character (`'\n'`).
 ### Usage
 
 ```console
-student@ubuntu:~/printdigits$ go build
-student@ubuntu:~/printdigits$ ./printdigits
+$ go run .
 0123456789
-student@ubuntu:~/printdigits$
+$
 ```

subjects/printnbr/README.md

@@ -36,8 +36,7 @@ func main() {
 And its output :
 
 ```console
-student@ubuntu:~/printnbr/test$ go build
-student@ubuntu:~/printnbr/test$ ./test
+$ go run .
 -1230123
-student@ubuntu:~/printnbr/test$
+$
 ```

subjects/printreversealphabet/README.md

@@ -11,8 +11,7 @@ Please note that `casting` is not allowed for this exercise!
 ### Usage
 
 ```console
-student@ubuntu:~/printreversealphabet$ go build
-student@ubuntu:~/printreversealphabet$ ./printreversealphabet
+$ go run .
 zyxwvutsrqponmlkjihgfedcba
-student@ubuntu:~/printreversealphabet$
+$
 ```