feat(solutions): add fizzbuzz/c/function

challenges/fizzbuzz/solutions/c/function/README.md

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+# fizzbuzz/c/function
+
+Created by [@Divlo](https://github.com/Divlo) on 29 September 2021.

challenges/fizzbuzz/solutions/c/function/solution.c

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+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+  int length;
+  scanf("%d", &length);
+  for (int number = 1; number <= length; number++) {
+    bool is_divisible_by_3 = number % 3 == 0;
+    bool is_divisible_by_5 = number % 5 == 0;
+    if (is_divisible_by_3 && is_divisible_by_5) {
+      printf("FizzBuzz\n");
+    } else if (is_divisible_by_3) {
+      printf("Fizz\n");
+    } else if (is_divisible_by_5) {
+      printf("Buzz\n");
+    } else {
+      printf("%d\n", number);
+    }
+  }
+  return EXIT_SUCCESS;
+}