author: Tomasz Biela (Tebe)
https://www.freepascal.org/docs-html/rtl/strutils/index-5.html
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AddChar | function AddChar(C: Char; var S: string; N: Byte): ^string;AddChar adds characters (C) to the left of S till the length N is reached, and returns the resulting string. If the length of S is already equal to or larger than N, then no characters are added. The resulting string can be thought of as a right-aligned version of S, with length N.
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AddCharR | function AddCharR(C: Char; var S: string; N: Byte): ^string;AddCharR adds characters (C) to the right of S till the length N is reached, and returns the resulting string. If the length of S is already equal to or larger than N, then no characters are added. The resulting string can be thought of as a left-aligned version of S, with length N .
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PadLeft | function PadLeft(var S: string; N: Byte): ^string;Add spaces to the left of a string till a certain length is reached.
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PadRight | function PadRight(var S: string; N: Byte): ^string;Add spaces to the right of a string till a certain length is reached.
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