Function validate_time_unit 

pub fn validate_time_unit(time_unit: &str) -> Result<Option<&str>, Error>

Validates the time unit string and returns an optional normalized time unit.

Arguments

• time_unit - A string representing the time unit to validate.

Returns

• Ok(None) if an empty string is provided
• Ok(Some(time_unit)) if the time unit is ‘MILLISECOND’, ‘MICROSECOND’, ‘millisecond’, or ‘microsecond’
• Err with an error message if an invalid time unit is provided

Errors

Returns Err(anyhow::Error) if time_unit is non-empty and not one of the allowed values.

Examples

let result = validate_time_unit("MILLISECOND“); assert!(result.is_ok());

let result = validate_time_unit(“”); assert!(result.is_ok() && result.unwrap().is_none());

let result = validate_time_unit("SECOND“); assert!(result.is_err());