实现 Sunday 匹配 needle在最末尾的时候返回结果异常

[mfacious]

s := "hello world abc is a test chars in program develop comm"
index := strStrSunday(s, "common")
fmt.Println("common index is", index)
正常应该返回-1， 实际会返回54 什么的

附上根据原链接java 版本实现的一个方法：

`
func strStrSunday(haystack string, needle string) int {
if len(haystack) < len(needle) {
return -1
}

  if haystack == needle {
	  return 0
  }

  originIndex := 0
  aimIndex := 0
  nextIndex := 0

  for aimIndex < len(needle) {
	  if originIndex > len(haystack)-1 {
		  return -1
	  }

	  if haystack[originIndex] == needle[aimIndex] {
		  originIndex++
		  aimIndex++
	  } else {
		  nextIndex = originIndex - aimIndex + len(needle)
		  if nextIndex < len(haystack) {
			  offset := strings.LastIndex(needle, string(haystack[nextIndex]))
			  if offset == -1 {
				  originIndex = nextIndex + 1
			  } else {
				  originIndex = nextIndex - offset
			  }

			  aimIndex = 0
		  } else {
			  return -1
		  }
	  }
  }

  return originIndex - aimIndex

}
`