lpad
Left-pads this Int to the specified width with padChar.
Extension function on Int. When padding a negative number with '0', the zeros go after the minus sign, as with "%0Nd": (-1).lpad(4) is "-001". Any other padChar goes before the sign: " -1".
Return
the left-padded string
Parameters
width
the minimum width of the resulting string
padChar
the character to pad with (default '0')