docs: Explain what to do when slice is empty or there are no even elements as per review

docs: remove piscine imports and refactor to remove variable as per review

subjects/evenlength/README.md

@@ -0,0 +1,33 @@
+## evenlength
+
+### Instructions
+
+Write a function that receives a slice of strings and returns a new slice with the strings in which the length is even. When the slice is empty or there are no even strings return an empty slice.
+
+### Expected function
+
+```go
+func EvenLength(strings []string) []string {
+}
+```
+
+### Usage
+
+Here is a possible program to test your function:
+
+```go
+package main
+
+import "fmt"
+
+func main() {
+    fmt.Println(EvenLength([]string{"Hi", "Hola", "Ola", "Ciao", "Salut", "Hallo"}))
+}
+```
+
+And its output:
+
+```console
+$ go run .
+[Hi Hola Ciao]
+```

subjects/getarea/README.md

@@ -1,25 +0,0 @@
-## get-area
-
-### Instructions
-
-Write a program that takes a positive number as radius and prints the area of a circle.
-  - The area of the circle is `3.14` times the radius squared.
-  - Only positive numbers will be accepted, otherwise print `Error` followed by (`'\n'`)
-  - If the number of arguments is not `1` print (`'\n'`)
-  - The output must be an integer.
-
-
-###  Usage
-
-```console
-$ go run . | cat -e
-$
-$ go run . 10 | cat -e
-314$
-$ go run . 4 | cat -e
-50$
-$ go run . -10 | cat -e
-Error$
-$ go run . "Hello World!" | cat -e
-Error$
-```

subjects/ultimatedivmod/README.md

@@ -2,7 +2,7 @@
 
 ### Instructions
 
-Create the following function.
+- Write a function that will be formatted as below.
 
 ### Expected function
 
@@ -11,9 +11,10 @@ func UltimateDivMod(a *int, b *int) {
 
 }
 ```
-`UltimateDivMod` should divide the dereferenced value of `a` by the dereferenced value of `b`.
-- Store the result of the division in the `int` which `a` points to.
-- Store the remainder of the division in the `int` which `b` points to.
+
+- This function will divide the `int` **a** and **b**.
+- The result of this division will be stored in the `int` pointed by **a**.
+- The remainder of this division will be stored in the `int` pointed by **b**.
 
 ### Usage