def functions_and_pointers_execute(command):
    if "define function" in command:
        try:
            func_name_start = command.index("define function") + len("define function") + 1
            func_name_end = command.index("with parameters")
            func_name = command[func_name_start:func_name_end].strip()
            
            params_start = command.index("with parameters") + len("with parameters") + 1
            params_end = command.index("that does")
            params = command[params_start:params_end].strip().split(',')
            
            body_start = command.index("that does") + len("that does") + 1
            body = command[body_start:].strip()
            
            exec(f"def {func_name}({', '.join(params)}): {body}")
            return f"Function {func_name} defined."
        except Exception as e:
            return f"An error occurred: {e}"

    elif "create a pointer called" in command:
        try:
            pointer_name = command.split("create a pointer called")[-1].strip()
            exec(f"global {pointer_name}; {pointer_name} = None")
            return f"Pointer {pointer_name} created."
        except Exception as e:
            return f"An error occurred: {e}"
        
    elif "point" in command and "to" in command:
        try:
            parts = command.split()
            pointer_name = parts[1]
            value = parts[-1]
            exec(f"{pointer_name} = {value}")
            return f"{pointer_name} now points to {value}."
        except Exception as e:
            return f"An error occurred: {e}"
    
    else:
        return "I don't understand that function or pointer command."

# Example helper function for use in commands
def sample_function(x, y):
    return x + y
