code: func IsDivisibleBy(str, num string) bool {
  	f, _ := ToFloat(str)
  	p := int64(f)
  	q, _ := ToInt(num)
  	if q == 0 {
  		return false
  	}
  	return (p == 0) || (p%q == 0)
  }
docs: // IsDivisibleBy check if the string is a number that's divisible by another.
  // If second argument is not valid integer or zero, it's return false.
  // Otherwise, if first argument is not valid integer or zero, it's return true (Invalid string converts to zero).