Remove unused utility functions ccap_free_string, ccap_strdup, and ccap_strnlen

Co-authored-by: wysaid <1430725+wysaid@users.noreply.github.com>

Author: Copilot

include/ccap_utils_c.h

@@ -79,29 +79,6 @@ CCAP_EXPORT bool ccap_save_rgb_data_as_bmp(const char* filename, const unsigned
                                uint32_t width, uint32_t line_offset, uint32_t height,
                                bool is_bgr, bool has_alpha, bool is_top_to_bottom);
 
-/* ========== Memory Utilities ========== */
-
-/**
- * @brief Free string allocated by ccap C functions
- * @param str String to free (can be NULL)
- */
-CCAP_EXPORT void ccap_free_string(char* str);
-
-/**
- * @brief Duplicate a string (similar to strdup)
- * @param str Source string
- * @return Duplicated string (caller must free with ccap_free_string), or NULL on failure
- */
-CCAP_EXPORT char* ccap_strdup(const char* str);
-
-/**
- * @brief Get the length of a string safely
- * @param str String to measure (can be NULL)
- * @param max_len Maximum length to check
- * @return String length, or 0 if str is NULL
- */
-CCAP_EXPORT size_t ccap_strnlen(const char* str, size_t max_len);
-
 /* ========== Logging Utilities ========== */
 
 /**

src/ccap_utils_c.cpp

@@ -105,39 +105,6 @@ bool ccap_save_rgb_data_as_bmp(const char* filename, const unsigned char* data,
                                   is_bgr, has_alpha, is_top_to_bottom);
 }
 
-/* ========== Memory Utilities ========== */
-
-void ccap_free_string(char* str) {
-    if (str) {
-        std::free(str);
-    }
-}
-
-char* ccap_strdup(const char* str) {
-    if (!str) {
-        return nullptr;
-    }
-
-    size_t len = std::strlen(str);
-    char* result = static_cast<char*>(std::malloc(len + 1));
-    if (result) {
-        std::memcpy(result, str, len + 1);
-    }
-    return result;
-}
-
-size_t ccap_strnlen(const char* str, size_t max_len) {
-    if (!str) {
-        return 0;
-    }
-
-    size_t len = 0;
-    while (len < max_len && str[len] != '\0') {
-        len++;
-    }
-    return len;
-}
-
 /* ========== Logging Utilities ========== */
 
 void ccap_set_log_level(CcapLogLevel level) {