StringsBuilder => strings.Builder; strings.repeat()

vlib/strings/strings.v

@@ -0,0 +1,13 @@
+module strings 
+
+pub fn repeat(c byte, n int) string {
+	if n <= 0 {
+		return ''
+	}
+	mut arr := malloc(n + 1)
+	for i := 0; i < n; i++ {
+		arr[i] = c
+	}
+	arr[n] = `\0`
+	return tos(arr, n)
+}