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Task/Rep-string/Icon/rep-string.icon

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+procedure main(A)
+   every write(s := !A,": ",(repString(s) | "Not a rep string!")\1)
+end
+
+procedure repString(s)
+    rs := s[1+:*s/2]
+    while (*rs > 0) & (s ~== lrepl(rs,*s,rs)) do rs := rs[1:-1]
+    return (*rs > 0, rs)
+end
+
+procedure lrepl(s1,n,s2)   # The standard left() procedure won't work.
+    while *s1 < n do s1 ||:= s2
+    return s1[1+:n]
+end