feat(cli): add --all option to run test command

challenges/hello-world/solutions/c/function/character.c

@@ -0,0 +1,10 @@
+#include "character.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';
+}

challenges/hello-world/solutions/c/function/character.h

@@ -0,0 +1,13 @@
+#ifndef __CHARACTER__
+#define __CHARACTER__
+
+/**
+ * @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);
+
+#endif

challenges/hello-world/solutions/c/function/input.c

@@ -0,0 +1,19 @@
+#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/hello-world/solutions/c/function/input.h

@@ -0,0 +1,11 @@
+#ifndef __INPUT__
+#define __INPUT__
+
+/**
+ * @brief Read a line from stdin.
+ *
+ * @return char*
+ */
+char* input();
+
+#endif

challenges/hello-world/solutions/c/function/solution.c

@@ -1,10 +1,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "input.h"
+
 int main() {
-  char input[1024];
-  while (scanf("%s", &input) != EOF) {
-    printf("Hello, %s!", input);
-  }
+  char *string = input();
+  printf("Hello, %s!\n", string);
   return EXIT_SUCCESS;
 }