feat(cyb): add cyb content, 3 first functions

config.yml

@@ -32,6 +32,8 @@ params:
         url: b2
       - name: "Sujets B3"
         url: b3
+      - name: "Sujets Cyber"
+        url: cyb
 
   # for search
   # https://fusejs.io/api/options.html
@@ -58,3 +60,7 @@ menu:
       name: "Sujets B3"
       url: b3
       weight: 10
+    - identifier: cyb
+      name: "Sujets Cyber"
+      url: cyb
+      weight: 50

content/cyb/_index.md

@@ -0,0 +1,3 @@
+---
+title: Sujets de Cyber
+---

content/cyb/basic/index.md

@@ -0,0 +1,106 @@
+---
+title: "Basic"
+author: "Clément"
+description: "Subjects about C language"
+---
+
+# Introduction
+
+This category shows training exercises about C language. For all questions,
+please ask on the BackToBasics' [Discord server](https://discord.gg/SJGWzkU2gd).
+
+A Makefile is already given with these rules:
+
+- `basics`: compiles ;
+- `debug`: compiles with debug flags ;
+- `check`: runs the testsuite ;
+- `clean`: removes all trash files.
+
+Moreover, you must use the following header file `basics.h`:
+
+```c
+#ifndef BASICS_H
+#define BASICS_H
+
+#include <stdlib.h>
+
+struct pair
+{
+    int x;
+    int y;
+};
+
+void fizzbuzz(int n);
+size_t my_strlen(char *s);
+long binary_number(char str[]);
+int hamming_distance(char *dna1, char *dna2);
+int is_isogram(char *s);
+struct pair move_robot(struct pair current, char *directions);
+
+#endif /* !BASICS_H */
+```
+
+You are only allowed to uses the functions defined in the following headers:
+- stdio.h
+
+All of the code must be done inside a `basics.c` file.
+
+Your code must compile with the following flags:
+`-std=c99 -pedantic -Wall -Wextra -Werror -Wvla`.
+
+Your code must not segfault and have any memory leak.
+
+# FizzBuzz
+
+## Goal
+
+You have to implement the following function:
+
+```c
+void fizzbuzz(int n);
+```
+
+This function displays on stdout the numbers from 1 to `n` with newlines.
+However, it must follow the rules:
+
+- for multiples of 3, it should print *"Fizz"* with a newline ;
+- for multiples of 5, it should print *"Buzz"* with a newline ;
+- for multiples of 3 and of 5, it should print *"FizzBuzz"* with a newline.
+
+## Example
+
+The output of `fizzbuzz(5)` is:
+
+```bash
+1
+2
+Fizz
+4
+Buzz
+```
+
+# My strlen
+
+You have to implement the following function:
+
+```c
+size_t my_strlen(char *s);
+```
+
+This functions returns the length of the string argument. The string can be
+null.
+
+# Binary number
+
+You have to implement the following function:
+
+```c
+long binary_number(char str[]);
+```
+
+This function returns the integer in decimal corresponding to the binary number
+given in argument.
+
+## Example
+
+The output of `my_strlen("110")` is `6`.