SumTime -
1. Change ClassName SumTime -> CustomTime
2. Merge lines in CustomTime#convert_seconds_to_time
3. Change regular Expression
4. Remove valid_bit and instead use valid? method
SumTime -
1. Change ClassName SumTime -> CustomTime
2. Merge lines in CustomTime#convert_seconds_to_time
3. Change regular Expression
4. Remove valid_bit and instead use valid? method