---
test case: "1. Simple string"
in:
  src: " World!"
  dst: "Hello"
  size: 13
out:
  result: "Hello World!"
---
test case: "2. Numeric string"
in:
  src: " 1E02 1E+02"
  dst: "1E02"
  size: 16
out:
  result: "1E02 1E02 1E+02"
---
test case: "3. Empty string"
in:
  src: ''
  size: 1
  dst: ""
out:
  result: ''
---
test case: "4. Numeric string"
in:
  src: '567'
  size: 8
  dst: "1234"
out:
  result: '1234567'
---
test case: "5. Numeric string with truncation"
in:
  src: '567'
  size: 6
  dst: "1234"
out:
  result: '12345'
...