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

challenges/is-palindrome/solutions/c/function/character.c

@@ -9,7 +9,7 @@ void character_append(char* string, char character) {
   string[length + 1] = '\0';
 }
 
-const char character_to_upper(const char character) {
+char character_to_upper(char character) {
   char ascii_a = 'a';
   char ascii_A = 'A';
   char ascii_z = 'z';

challenges/is-palindrome/solutions/c/function/character.h

@@ -1,5 +1,5 @@
-#ifndef CHARACTER_H
-#define CHARACTER_H
+#ifndef __CHARACTER__
+#define __CHARACTER__
 
 /**
  * @brief Append a character to a string, assuming string points to an array
@@ -14,8 +14,8 @@ void character_append(char* string, char character);
  * @brief Converts the character to uppercase.
  *
  * @param character
- * @return const char
+ * @return char
  */
-const char character_to_upper(const char character);
+char character_to_upper(char character);
 
 #endif

challenges/is-palindrome/solutions/c/function/input.c

@@ -1,6 +1,7 @@
 #include "input.h"
 
 #include <stdio.h>
+#include <stdlib.h>
 
 #include "character.h"
 

challenges/is-palindrome/solutions/c/function/input.h

@@ -1,5 +1,5 @@
-#ifndef INPUT_H
-#define INPUT_H
+#ifndef __INPUT__
+#define __INPUT__
 
 /**
  * @brief Read a line from stdin.

challenges/is-palindrome/solutions/c/function/string.c

@@ -18,7 +18,7 @@ char* string_to_upper(const char* string) {
 char* string_reverse(const char* string) {
   size_t string_length = strlen(string);
   char* result = malloc(sizeof(char) * (string_length + 1));
-  for (size_t index = string_length - 1; index != -1; index--) {
+  for (int index = string_length - 1; index != -1; index--) {
     character_append(result, string[index]);
   }
   return result;

challenges/is-palindrome/solutions/c/function/string.h

@@ -1,5 +1,5 @@
-#ifndef STRING_H
-#define STRING_H
+#ifndef __STRING__
+#define __STRING__
 
 #include <stdbool.h>