---
test case: "1. Default string"
in:
  haystack: "Hello, World!"
  needle: "world"
out:
  string: "World!"
---
test case: "2. Empty string"
in:
  haystack: ""
  needle: ""
out:
  string: ""
---
test case: "3. Numeric string"
in:
  haystack: "-2147483648/-1"
  needle: "4"
out:
  string: "47483648/-1"
---
test case: "5. Special characters string"
in:
  haystack: ",./;'[]-="
  needle: "[]"
out:
  string: "[]-="
---
test case: "6. Backslash"
in:
  haystack: 'adad\adad'
  needle: '\'
out:
  string: '\adad'
---
test case: "7. Quotation mark"
in:
  haystack: 'Quotation mark"Quotation mark'
  needle: '"'
out:
  string: '"Quotation mark'
---
test case: "8. Newline"
in:
  haystack: "NewlineNewline\nNewline"
  needle: "\n"
out:
  string: "\nNewline"
...