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Programming-Idioms

# 341 Find substring last position
Set i to the position of the last occurrence of the string y inside the string x, if exists.

Specify if i should be regarded as a character index or as a byte index.

Explain the behavior when y is not contained in x.
New implementation

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Other implementations 
import "strings"
i := strings.LastIndex(x, y)
StrUtils
i := RPos(y,x);
i = x.rfind(y)
i = x.rindex(y)
let i = x.rfind(y);

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