chore: initial commit

lib/character.h

@@ -0,0 +1,59 @@
+#ifndef __CHARACTER__
+#define __CHARACTER__
+
+#include <stdbool.h>
+#include <stdlib.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);
+
+/**
+ * @brief Append a character to a string at a specific index, assuming string points to an array with enough space.
+ *
+ * @param string
+ * @param character
+ * @param index
+ */
+void character_append_at(char* string, const char character, const size_t index);
+
+/**
+ * @brief Converts the character to uppercase.
+ *
+ * @param character
+ * @return const char
+ */
+char character_to_upper(const char character);
+
+/**
+ * @brief Converts the character to lowercase.
+ *
+ * @param character
+ * @return const char
+ */
+char character_to_lower(const char character);
+
+/**
+ * @brief Check if the character is a digit ('0', '1', '2', '3', '4', '5', '6', '7, '8' or '9').
+ *
+ * @param string1
+ * @param string2
+ * @return true if the character is a digit, false otherwise
+ */
+bool character_get_is_digit(const char character);
+
+/**
+ * @brief Get the position in latin alphabet of the letter (case-insensitive) from 1 to 26.
+ * Return 0 if the character is not a letter.
+ *
+ * @param character
+ * @return char
+ */
+unsigned char character_get_alphabet_position(const char character);
+
+#endif