-bool HasSuffix(const char *s, const char *suffix);
-bool HasSuffixC(const char *s, int c);
-void TrimSuffixC(char *s, int c);
-void ToLower(char *s);
-void ToUpper(char *s);
+bool has_suffix(const char *s, const char *suffix);
+bool has_suffix_c(const char *s, int c);
+void trim_suffix_c(char *s, int c);
+void to_lower(char *s);
+void to_upper(char *s);