Function convert_time

Convert time from one unit to another # Arguments `time_value` - The time value to convert (must be non-negative) `unit_from` - The source unit (case-insensitive) `unit_to` - The target unit (case-insensitive) # Returns Returns the converted time value rounded to 3 decimal places # Errors Returns an error if: `time_value` is negative or not a valid number `unit_from` or `unit_to` is not a va

(time_value: f64, unit_from: &str, unit_to: &str)