Function check_nonempty_string 

pub fn check_nonempty_string<T: AsRef<str>>(s: T, param: &str) -> Result<()>

Checks if the string s is not empty.

This function performs a basic check to ensure the string has at least one character. Unlike check_valid_string, it does not validate ASCII characters or check for whitespace.

Errors

Returns an error if s is empty.