Add: String functionality to trim spaces from C-style strings

src/string_func.h

@@ -49,6 +49,7 @@ bool strtolower(char *str);
 bool strtolower(std::string &str, std::string::size_type offs = 0);
 
 bool StrValid(const char *str, const char *last);
+void StrTrimInPlace(char *str);
 
 /**
  * Check if a string buffer is empty.