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subjects/cameltosnakecase/README.md

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+## Camel-to-snake-case 
+
+### Instructions
+Write a function that converts a string from `CamelCase` to `snake_case`.
+
+Camel case is the practice of writing phrases without spaces or punctuation, it indicates the separation of two words with a single capitalized letter. Snake case is a style of writing in which each space is replaced by an underscore (_) character.
+
+Here are some rules for you to follow:
+
+- If the string is empty, return an empty string.
+- If the string is not `CamelCase`, return the string unchanged.
+- If the string is `CamelCase`, return the `snake_case` version of the string.
+
+Basic `CamelCase` Capitalization Rules:
+
+- The first letter must be capitalized.
+- The word must not have two capitalized letters together (CamelCAse) nor end with a capitalized letter (CamelCasE).
+- No numbers or punctuations are allowed in the word at any place (CamelCase1more).
+
+
+### Expected function 
+```go
+func CamelToSnakeCase(s string) string{
+    //Your code here
+}
+```
+
+### Usage 
+
+Here is a possible program to test your function:
+
+```go
+package main
+
+import "fmt"
+
+func main() {
+    fmt.Println(CamelToSnakeCase("HelloWorld")) 
+    fmt.Println(CamelToSnakeCase("helloWorld"))
+    fmt.Println(CamelToSnakeCase("CamelToSnakeCase"))
+    fmt.Println(CamelToSnakeCase("132322"))
+}
+```
+
+and the output should be:
+
+```console
+$ go run .
+Hello_World
+helloWorld
+Camel_To_Snake_Case
+132322
+```
+