Clean

Clean and tiny up a bit the code

Also solves #40 (closed)

inc/common/common.h

@@ -36,3 +36,5 @@ char *trim(char *str, size_t len, char c);
 int get_stdin_line(const char *prompt, char *buf, size_t len);
 
 int read_self_exe(char *path, size_t len);
+
+int safe_snprintf(char *dest, const size_t max_len, const char *format, ...);