feat(solutions): add print-pyramid/c/function

challenges/print-pyramid/solutions/c/function/README.md

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

challenges/print-pyramid/solutions/c/function/character.c

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+#include "character.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void character_append(char* string, char character) {
+  size_t length = strlen(string);
+  string[length] = character;
+  string[length + 1] = '\0';
+}
+
+void character_print(char* character, int number_of_times) {
+  for (size_t iteration = 0; iteration < number_of_times; iteration++) {
+    printf("%s", character);
+  }
+}

challenges/print-pyramid/solutions/c/function/character.h

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+#ifndef CHARACTER_H
+#define CHARACTER_H
+
+/**
+ * @brief Append a character to a string, assuming string points to an array
+ * with enough space.
+ *
+ * @param string
+ * @param character
+ */
+void character_append(char* string, char character);
+
+void character_print(char* character, int number_of_times);
+
+#endif

challenges/print-pyramid/solutions/c/function/input.c

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+#include "input.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "character.h"
+
+char* input() {
+  char character;
+  size_t length = 1;
+  char* string = malloc(length * sizeof(char));
+  *string = '\0';
+  while ((character = getchar()) != '\n' && character != EOF) {
+    length++;
+    string = realloc(string, length * sizeof(char));
+    character_append(string, character);
+  }
+  return string;
+}

challenges/print-pyramid/solutions/c/function/input.h

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+#ifndef INPUT_H
+#define INPUT_H
+
+/**
+ * @brief Read a line from stdin.
+ *
+ * @return char*
+ */
+char* input();
+
+#endif

challenges/print-pyramid/solutions/c/function/solution.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "character.h"
+#include "input.h"
+
+int main() {
+  char* type = input();
+  int height;
+  scanf("%d", &height);
+
+  int step = strcmp(type, "normal") == 0 ? 1 : height;
+  while ((strcmp(type, "normal") == 0 && step <= height) || (strcmp(type, "reverse") == 0 && step != 0)) {
+    int numberOfStars = (step * 2) - 1;
+    int totalNumberOfLocations = (height * 2) - 1;
+    int totalNumberOfSpaces = totalNumberOfLocations - numberOfStars;
+    int numberOfSpacesOnEachSide = totalNumberOfSpaces / 2;
+    character_print(" ", numberOfSpacesOnEachSide);
+    character_print("*", numberOfStars);
+    character_print(" ", numberOfSpacesOnEachSide);
+    printf("\n");
+    step = strcmp(type, "normal") == 0 ? step + 1 : step - 1;
+  }
+
+  return EXIT_SUCCESS;
+}