feat(solutions): add prefix-suffix/c/function

challenges/prefix-suffix/solutions/c/function/string.h

@@ -0,0 +1,26 @@
+#ifndef __STRING__
+#define __STRING__
+
+#include <stdbool.h>
+
+/**
+ * @brief Returns true if the string is a prefix of another string.
+ *
+ * @param string
+ * @param prefix
+ * @return true
+ * @return false
+ */
+bool string_starts_with(char* string, char* prefix);
+
+/**
+ * @brief Returns true if the string is a suffix of another string.
+ *
+ * @param string
+ * @param suffix
+ * @return true
+ * @return false
+ */
+bool string_ends_with(char* string, char* suffix);
+
+#endif