The strings library

As these functions are in effect wrappers around their Golang counterparts, I hope it will suffice for now just to give the signatures of the functions in the library without detailed descriptions of what they do.

• compare(a, b string)
• contains(s, substr string)
• containsAny(s, chars string)
• count(s, substr string)
• cut(s, sep string)
• equalFold(s, t string)
• fields(s string)
• hasPrefix(s, prefix string)
• hasSuffix(s, suffix string)
• index(s, substr string)
• indexAny(s, chars string)
• lastIndex(s, substr string)
• lastIndexAny(s, chars string)
• repeat(s string, c int)
• replace(s string, old string, new string, n int)
• replaceAll(s string, old string, new string)
• split(s string, sep string)
• splitAfter(s string, sep string)
• splitAfterN(s string, sep string, n int)
• splitN(s string, sep string, n int)
• toLower(s string)
• toTitle(s string)
• toUpper(s string)
• toValidUTF8(s, replacementString string)
• trim(s, cutset string)
• trimLeft(s, cutset string)
• trimPrefix(s, prefix string)
• trimRight(s, cutset string)
• trimSuffix(s, prefix string)